Thanthos, God of Mortality

Indestructible, Menace
If an opponent controls less creatures than you, Thanthos isn't a creature.
At the end of each opponent's end step, if they
control more creatures than you, thet sacrifice a creature.
At the beginning of your upkeep, if you control
the least amount of creatures, you may put a
creature from your graveyard onto the battlefield.
It gains haste until end of turn.