Elden Beast

Menace, Flying
Ring Distortion {4}: Put a ring counter on three
target creatures. At the beginning of every end
step, you may destroy a creature at random with
a ring counter on it. If all creatures in play
(except yours) have a ring counter on them,
destroy all creatures with a ring counter.
The Elden Beast's base power and toughness is
equal to the Greatrunes you collected, x2.