Gluttony

Vigilance, deathtouch, dauntless (This creature
attacks each combat if able.)
Whenever another creature dies, you gain 2 life
and put a +1/+1 counter on Gluttony.
At the beginning of each upkeep, that player sacrifices a non-Sin creature. If the player can't,
you lose half your life, rounded down.
The embodiment of insatiable hunger.