Dinilysia

Deathtouch, vigilance

{g}{g}, {t}: Dinilysia fights target creature with lesser
toughness. Then, if that creature dies this turn, put
X stun counters on Dinilysia, where X is one plus
the number of +1/+1 counters on it. Then put a
+1/+1 counter on Dinilysia.

If Dinilysia would untap during your untap step
while it has a stun counter on it, remove a stun
counter from it instead.