God Cthulhu

Indestructible, Hexproof
Aligned with the Stars - Cthulhu can't attack or
block unless there are one of each basic land types
controlled by any player. (Plains, island, swamp,
mountain, forest.)
Cthulhu gets +3/+3 for each basic land type.
Whenever Cthulhu attacks each opponent discards
two card at random, mills 5, sacrifices three
nontoken creatures they control, and exiles all
cards from their graveyards.