Sugilite, Unleashed

Trample, 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.)
When Sugilite, Unleashed enters the battlefield
and whenever it attacks, choose one: Destroy
target artifact, or each player sacrifices a land.