Cthulhu (Ancient One)

Indestructible, flying, freying mind (Any creature
that targets Cthulhu with an ability, blocks or becomes blocked by Cthulhu gets a -1/-1 counter every end
step.)
Cthulhu's power is equal to the number of
creatures you control, you may gain control
of two creature per turn with converted
mana cost equal to or lower than Cthulhu's
power. Other creatures you control get a -1/-1
counter every upkeep.