Hi, so I researched the shadow the hedgehog at edhrec and idk which factor should I focus on.
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fossil hemlock
last birch
When I built Shadow, I made him the commander of a Blitz Aristocrats strategy.
My top recommendation for most Shadow decks is [[Jaxis, The Troublemaker]].
wicked irisBOT
Legendary Creature — Human Warrior
, 
, Discard a card: Create a token that's a copy of another target creature you control. It gains haste and "When this token dies, draw a card." Sacrifice it at the beginning of the next end step. Activate only as a sorcery.
Blitz 
(If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step.)
2/3
fossil hemlock
https://scryfall.com/card/snc/112/jaxis-the-troublemaker
do i have to cast on blitz or regular
last birch
Regular is generally better, if she sticks around. But paying her blitz cost is good too if you have reanimation handy.
If you copy shadow, the copy dies to the legend rule and you draw 3.
fossil hemlock
If you copy shadow, the copy dies to the legend rule and you draw 3.
wait 3
last birch
Shadow 2 dies, Shadow 1 sees Shadow 2 die, the copy had "When this creature dies, draw a card."