Erdtree

When Erdtree enters the battlefield, you may let
an opponent create a 4/4 Avatar creature token
with vigilance and defender or three 1/2
Guardian creature tokens with vigilance and
defender. If you don't, it enters the battlefield
tapped and you lose 10 life.
{t}: Add {g/w}{g/w}{g/w}. Erdtree takes two turns to
untap.