I'd argue that Y'shtola falls in the "too strong" category and not a fan of how power-creepy it is, but it's hard to deny that this will excite a lot of players who like obviously powerful commanders
The sac outlets further help by offering their own value, often having replaced some mana or card cost on an effect
Kida, Tinkerbell, Ursula
One reason I dont run these cards often is because I dont like to Time Walk myself
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Ill mention some other creatures which are fun but not that great in this type of deck
