Oma, Overseer Of Land

Trample
Whenever Oma would enter your graveyard,
shuffle it into your library instead.
Players with the most lands can't play Lands.
Oma is not a creature unless the average number
of lands on the battlefield under your opponents control is 8 or more
Oma's power and toughness are each equal to the number of lands you control
Whenever Oma deals combat damage to a player,
each player sacrifices a land