Dragon of the Frozen North

Flying
Freeze {2}{s} (Whenever this creature deals combat
damage to another creature, put a Frostbite counter on
that creature, unless its owner pays {2}{s}. A creature
with a Frostbite counter on it can't attack or block.)
Melting - Whenever this creature leaves the
battlefield, exile it instead. If you do, add {u} to
your mana pool.