Chronos, the Grim Reaper

Menace, Fear, Doublestrike
When a creature an opponent control with a
harvest counter dies, return it to the battlefield at
the beginning of the next endstep.
Creatures with Harvest counters on them have at
the beginning of your upkeep discard a card and
you lose 1 life
{3},{t}, Sacrifice X creatures: Put a harvest counter
on X creatures, you lose X life.