Yahenni, Undying Partisan

Return up to three target artifacts and/or creatures to their owners' hands. You may cast a spell with mana value 4 or less from your hand without paying its mana cost.

Whenever Gonti's Aether Heart or another artifact you control enters, you get EE (two energy counters). Pay eight E, Exile Gonti's Aether Heart: Take an extra turn after this one.

Double strike, haste Whenever this creature attacks, you get EE (two energy counters), then you may pay eight E. If you pay, untap all creatures you control, and after this phase, there is an additional combat phase.

Flying When this Vehicle enters, you get EE (two energy counters). Pay E: This Vehicle gains lifelink until end of turn. Crew 1 (Tap any number of creatures you control with total power 1 or more: This Vehicle becomes an artifact creature until end of turn.)

All creatures get -3/-3 until end of turn. You may cast a spell with mana value 3 or less from your hand without paying its mana cost.

When Rishkar enters, put a +1/+1 counter on each of up to two target creatures. Each creature you control with a counter on it has "T: Add G."

Destroy X target artifacts and/or creatures. For each permanent destroyed this way, its controller reveals cards from the top of their library until an artifact or creature card is revealed and exiles that card. Those players put the exiled cards onto the battlefield, then shuffle.

Flying If you would lose the game, instead exile this creature and your life total becomes equal to your starting life total.