Swamp Thing

Swampwalk, Forestwalk, Lifelink
When Swamp Thing attacks, return any number
of Land Cards from your graveyard to the battlefield.
Lose X life where X is the total number of lands
you control
Swamp Thing's Power and Toughness are equal
to half the number of Lands you own on the
Battlefield or in the Graveyard, rounded down