Yirshost, Permafrost Sovereign

Flying, Haste
Whenever a snow permanent or a permanent
with an ice counter is sent from the battlefield to
the graveyard, you may return Yirshost,
Permafrost Sovereign from the graveyard to the
battlefield.
Whenever Yirshost, Permafrost Sovereign deal
damage to a creature, Tap it and put an ice
counter on it. It doesn't untap during its
controller untap step as long as it has an ice
counter.