Sorin, the Unawakened

Lifelink
Whenever a non artifact creature an opponent
controls is put into the graveyard from the
battlefield, you may pay {2}. If you do, create a
1/1 black Vampire Knight creature tokens with
lifelink .
Sorin, the Unawakened's power and toughness is
equal to two plus the amount of life you gained
this turn.