Poseidon, Scourge of the Sea

Indestructible
{t}: Add {b}, {r}, or {g}.
Mana does not empty from your mana pool as
phases end.
At the end of your turn, create an X/X Black/Red/Green Leviathan
creature token, where X is the amount of mana in
your mana pool.
Once a fair ruler of the sea, now a destructive
force of nature.