The Shrike

Vigilance Flying Deathtouch Hexproof
Whenever your opponent loses life, you
gain that much life.
Whenever a creature dies, put a +1/+1
counter on The Shrike.
Sacrifice a creature, The Shrike gains
Indestructible until end of turn.
"Listen, and understand! The Shrike is out
there! It can't be bargained with. It can't be
reasoned with. It doesn't feel pity, or
remorse, or fear. And it absolutely will not
stop... ever, until you are dead!"