Giant Frog

When Giant Frog enters the battlefield, exile
target creature opponent controls until giant
frog leaves the battlefield. At the beginning of
your upkeep, put a -1/-1 counter on that
creature, and giant frog takes damage equal to
the exiled creatures power. If a creature exiled
with giant frog dies, you may choose another
target creature and exile it in the same way.
{g}{b}{1}{t}:Regenerate giant frog