Flash
Reach
Whenever another non-Human creature enters the battlefield under your control, you may pay . When you do, put X +1/+1 counters on Wildborn Preserver.
Haste
Whenever a creature an opponent controls dies, put a +1/+1 counter on Yahenni, Undying Partisan.
Sacrifice another creature: Yahenni gains indestructible until end of turn.