Volcanic Wurm

Trample
Creatures blocking Volcanic Wurm get a -1/-1 counter.
Eruption (Pay {1}{r}, sacrifice Volcanic Wurm and deal X damage divided as you choose to any number
of Players and Creatures. If a creature would be dealt damage this way, instead place that many
-1/-1 counters on it instead. X is equal to Volcanic Wurm strength.