The Chamber of Rings

{1}{t}: Draw a card, then flip two coins. If both
are heads, target player sacrifices two lands. If
both are tails, target player sacrifices two
creatures. Otherwise, deal six damage divided
as you choose among up to two target creatures
or players.
There are thousands of permutations, one for
each individual arrangement of the rings. But all
of them lead to some form of mass destruction.