Kicker (You may pay an additional as you cast this spell.)Create a token that's a copy of target creature. If this spell was kicked, create five of those tokens instead.
HasteWhenever a creature an opponent controls dies, put a +1/+1 counter on Yahenni.Sacrifice another creature: Yahenni gains indestructible until end of turn.
This enchantment enters with X study counters on it.When this enchantment enters and whenever you cast your first spell with in its mana cost each turn, create a 0/0 green and blue Fractal creature token. Put a number of +1/+1 counters on it equal to the number of study counters on this enchantment.
Each player puts a vow counter on a creature they control and sacrifices the rest. Each of those creatures can't attack you or planeswalkers you control for as long as it has a vow counter on it.
Target creature you control gets +X/+X until end of turn. Then it fights up to one target creature you don't control. (Each deals damage equal to its power to the other.)
At the beginning of your upkeep, create a 2/1 white and black Inkling creature token with flying. When you do, return up to one target Aura or Equipment card from your graveyard to the battlefield attached to that token.
Whenever one or more cards leave your graveyard, put a +1/+1 counter on this creature, then you may have this creature become a copy of an artifact or creature card from among those cards until end of turn.