Huu's Swamp Monster

Whenever a blue or green creature enters the battlefield under your control, you may reveal the
top four cards of your library and put a land card
from among them into your hand.
"If you listen hard enough, you can hear every living
thing breathing together. You can feel everything
growing. We're all living together, even if most folks
don't act like it. We all have the same roots, and we
are all branches of the same tree." - Huu