Magmarus, the Red

First Strike, Vigilance, Haste, Trample
Plane of Murder-Whenever a creature dies, its controller takes 2 damage
Daily Slaughter-At the beginning of your upkeep
each player must sacrifice a creature they control
Dark Power-This creature gets +X/+X until end
of turn, where X is equal to the amount of life
you have lost this turn, then gain X life