Maokai, The Twisted Treant

Landfall — Whenever a land you control
enters, manifest dread if this is the first time
this ability has resolved this turn. Otherwise,
you may turn a permanent you control face
up. (To manifest dread, look at the top two cards
of your library. Put one onto the battlefield face
down as a 2/2 creature and the other into your
graveyard. Turn it face up any time for its mana
cost if it's a creature card.)