Building my first deck from cards I have laying around. What appreciate some advice. https://archidekt.com/decks/11031873/arabella_meets_goblins
#Arabella
limber marsh
west arrow
[[decadent dragon]] cant be played in this deck as its identity is red-black, so it should be replaced
twin ridgeBOT
Creature — Dragon
Flying, trample
Whenever Decadent Dragon attacks, create a Treasure token.
4/4
Expensive Taste 
Instant — Adventure
Exile the top two cards of target opponent's library face down. You may look at and play those cards for as long as they remain exiled.
west arrow
[[okreta's monument]] can reduce mana cost plus makes extra tokens
twin ridgeBOT
west arrow
[[oketra's monument]]
twin ridgeBOT
Legendary Artifact
White creature spells you cast cost 
less to cast.
Whenever you cast a creature spell, create a 1/1 white Warrior creature token with vigilance.
"The worthy shall respect the worthy. In the afterlife, all will stand united." —Monument inscription
west arrow
[[dazzling theater/prop room]] i reckon should be moved to mainboard. its great to use creatures like mana dorks and untapping ability is more effective than [[white plume adventurer]] as its not a dungeon deck
twin ridgeBOT
Enchantment — Room
Creature spells you cast have convoke. (Your creatures can help cast those spells. Each creature you tap while casting a creature spell pays for or one mana of that creature's color.)
(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)
Prop Room 
Enchantment — Room
Untap each creature you control during each other player's untap step.
(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)