Bjorin, Odin's Howl

Avalanche {x} ({x}, Return a Snow
permanent you control to hand: Put this card
onto the battlefield it gains haste, then at the beginning of your end step return this creature to your hand and you lose 2 life.)
When Bjorin enters it deals X damage to each opponent
Whenever you lose life, put that many +1/+1 counters on Bjorin