Malachite, the Abyssal

Hexproof, Gem Fusion (When this enters the
battlefield, exile two other Gems you control and
put a +1/+1 counter on this for each color it shares
with those Gems. Otherwise, sacrifice this. When
this leaves the battlefield, return those Gems to the
battlefield under their owners' control.)
Sacrifice an Island, {2}{g/u}{g/u}: Create a 4/4 blue
Elemental creature token with reach. Malachite,
the Abyssal loses hexproof until end of turn.