This is one of my first ever attempts at building a deck and looking for a bit of help, this deck feels like it's missing something.
#Budget Commander deck (Thalia, gitrog monster)
high monolith
high monolith
Bump
high monolith
Bump....but again
split jasper
I see you are focusing on lifegain and draining opponents, but why not put that extra life to some use
Bloomburrow stuff has some nice new tech
[[Darkstar Augur]]
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Creature — Bat Warlock
Offspring 
(You may pay an additional as you cast this spell. If you do, when this creature enters, create a 1/1 token copy of it.)
Flying
At the beginning of your upkeep, reveal the top card of your library and put that card into your hand. You lose life equal to its mana value.
2/3
split jasper
And other effects like that [[dark confidant]] or [[dark tutelage]]
split jasper
Or even good old [[phyrexian arena]]
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split jasper
Speaking of card draw [[pitiless carnage]] is juicy
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Sorcery
Sacrifice any number of permanents you control, then draw that many cards.
Plot 
(You may pay and exile this card from your hand. Cast it as a sorcery on a later turn without paying its mana cost. Plot only as a sorcery.)
Akul saw his Hellspur followers as little more than ammunition to be expended.
split jasper
You are making lots of food or filling graveyard why not run [[feed the cycle]]
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Instant
As an additional cost to cast this spell, forage or pay . (To forage, exile three cards from your graveyard or sacrifice a Food.)
Destroy target creature or planeswalker.
Sleeping beneath the sumac —Squirrelfolk expression meaning "death"
split jasper
I can see you're not running any mana rocks
Mainly land ramp and giving tokens mana abilities
I would strenghten the land theme a bit by adding something like [[ramunap excavator]]
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split jasper
[[world shaper]] is a classic
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split jasper
If you want to stick to tokens more [[jaheira, friend of the forest]] is DIY [[cryptolithrite]]
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Legendary Creature — Human Elf Druid
Tokens you control have "
: Add 
."
Choose a Background (You can have a Background as a second commander.)
"The Harpers' movement grows, but it needs sunlight to blossom. We can be that light."
2/3
Enchantment
Creatures you control have ": Add one mana of any color."
The chant was incomprehensible, but its power was unmistakable.
split jasper
If you want to stick to tokens more [[jaheira, friend of the forest]] is DIY [[c...
Which makes not only your foods tap for mana but also all the 1/1s you are making
I heard [[Lunar convocation]] is very underrated
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Enchantment
At the beginning of your end step, if you gained life this turn, each opponent loses 1 life.
At the beginning of your end step, if you gained and lost life this turn, create a 1/1 black Bat creature token with flying.
, Pay 2 life: Draw a card.
split jasper
It's on a [[bitterblossom]] level in right hands
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split jasper
https://scryfall.com/card/blb/223/lunar-convocation
Duh, it even lets you draw cards
Also this is something you may not know before playing Thalia and Gitrog
This commander is screaming "I WILL MAKE YOUR LIFE MISERABLE, PLEASE POINT REMOVAL HERE"
I know this because when I got to play my Lady and the Frog deck, I put a huge target on my back since everyone was annoyed by their things entering tapped
I completely shut down my friend's deck who was playing jund New Capenna precon (the blitz one), since he literally couldn't utilize blitz by attacking.
So slap some boots on this bad boy you will thank me later
[[Swiftfoot boots]], [[lightning greaves]]
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Artifact — Equipment
Equipped creature has hexproof and haste. (It can't be the target of spells or abilities your opponents control.)
Equip
"There is great wisdom in rushing headlong into combat . . . if you're prepared." —Kenjek, captain of the Thousand Swords
Artifact — Equipment
Equipped creature has haste and shroud. (It can't be the target of spells or abilities.)
Equip 
After lightning struck the cliffs, the ore became iron, the iron became steel, and the steel became greaves. The lightning never left.
split jasper
Or if you're fancy, you could go for spells that make come back instantly after being pointed removal at
[[Undying malice]] [[not dead after all]] [[feign death]]
split jasper
Speaking of recursion [[vat of rebirth]] is likely to go under your opponents' radar but provide great value to you
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Artifact
Whenever another artifact or creature you control is put into a graveyard from the battlefield, put an oil counter on Vat of Rebirth.
, , Remove four oil counters from Vat of Rebirth: Return target creature card from your graveyard to the battlefield. Activate only as a sorcery.
split jasper
Especially when you're utilizing your foods
Another thing is sac outlets
You will be stuck with a large board of tokens that will drag attention if you are not able to consistently sacrifice things
Budget options I can think of are [[woe strider]], [[yahenni, undying partisan]], [[phyrexian ghoul]], [[viscera seer]]
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Creature — Horror
When Woe Strider enters, create a 0/1 white Goat creature token.
Sacrifice another creature: Scry 1.
Escape—
, Exile four other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)
Woe Strider escapes with two +1/+1 counters on it.
3/2
split jasper
Also [[spawning pit]]
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Artifact
Sacrifice a creature: Put a charge counter on Spawning Pit.
, Remove two charge counters from Spawning Pit: Create a 2/2 colorless Spawn artifact creature token.
split jasper
And if you'd like to go for something a bit more expensive (but not much) [[ashnod's altar]]
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Artifact
Sacrifice a creature: Add 
.
"If you work at sawing up carcasses, you notice how the joints fit, how the nerves are arrayed, and how the skin peels back." —Ashnod, to Tawnos
split jasper
It's all about those death triggers, drain, gain
Without a reliable sac outlet you will be stuck thinking about how to get your creatures killed so that X drains life, Teysa doubling that and so on
high monolith
Awesome! That's for the advice so far, do you have any cards that you see so far that I should get rid of to swap out with some of these?
split jasper
[[Vizkopa guildmage]] seems a bit mana heavy if you want to rely on it's abilities. That reminds me [[exsanguinate]] exists and is scary with access to more mana
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Creature — Human Wizard
: Target creature gains lifelink until end of turn.
: Whenever you gain life this turn, each opponent loses that much life.
2/2
split jasper
X = 5 drains others for 5 and gains you 15. That's a neat trade for 7 mana
high monolith
Yeah that is definitely really solid
split jasper
Similar effect has [[gray merchant]] (cheap version) or [[kokusho]] but that one is definitely not in budget
split jasper
[[Gray merchant of asphodel]]
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Creature — Zombie
When Gray Merchant of Asphodel enters, each opponent loses X life, where X is your devotion to black. You gain life equal to the life lost this way. (Each in the mana costs of permanents you control counts toward your devotion to black.)
2/4
split jasper
I don't know what happened to my previous message but can't see it
split jasper
I don't know what happened to my previous message but can't see it
In that case let's repeat
[[Valentin]] is more of a graveyard hate rather than token maker
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split jasper
[[Valentin, dean of the vein]]
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Legendary Creature — Vampire Warlock
Menace, lifelink
If a nontoken creature an opponent controls would die, exile it instead. When you do, you may pay . If you do, create a 1/1 black and green Pest creature token with "When this creature dies, you gain 1 life."
1/1
Lisette, Dean of the Root
Legendary Creature — Human Druid
Whenever you gain life, you may pay . If you do, put a +1/+1 counter on each creature you control and those creatures gain trample until end of turn.
"Life is as fleeting as it is vibrant. Embrace the brief blessing of a flower before it withers."
4/4
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[[Pride sovereign]] is too slow to be worth it
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Creature — Cat
Pride Sovereign gets +1/+1 for each other Cat you control.
, , Exert Pride Sovereign: Create two 1/1 white Cat creature tokens with lifelink. (An exerted creature won't untap during your next untap step.)
2/2
split jasper
Another addition you could make is [[nadier's nightblade]]
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split jasper
[[Dawn of hope]] has the same problem as the guildmage
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Enchantment
Whenever you gain life, you may pay . If you do, draw a card.
: Create a 1/1 white Soldier creature token with lifelink.
"To wage war, secure peace within yourself." —Emmara
split jasper
Not great rate for incidental card draw
[[Feed the cauldron]] can be swapped for [[bake into a pie]]
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Instant
Destroy target creature with mana value 3 or less. If it's your turn, create a Food token. (It's an artifact with ", , Sacrifice this artifact: You gain 3 life.")
Kellan heard Agatha howl when he slammed into her, heard her scream as she fell into the cauldron, but couldn't afford to think about the implications just yet.
Instant
Destroy target creature. Create a Food token. (It's an artifact with ", , Sacrifice this artifact: You gain 3 life.")
"My secret ingredient? Well, I can't tell you that. But here's a hint. It's not love."
split jasper
https://scryfall.com/card/jmp/201/bake-into-a-pie
It's also a flavor win but with less hoops to get the full value
Hmmm, I'm thinking about that [[overrun]]. It's a great finisher but aristocrats rarely go for combat damage win.
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split jasper
You also have [[motivated pony]] which offers more synergy
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