Dizzy, The Unkillable Snowman

Riot, riot, riot, menace, trample
As long as this creature has a +1/+1 counter it has
Indestructible and cannot be exiled. At the end of
each turn, if this creature took damage that turn,
remove a +1/+1 counter from this creature.
Snowfall — Whenever another snow permanent
enters the battlefield under your control put a
+1/+1 counter on this creature.