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You can remove all Spell Counters on the field to inflict 500 damage to your opponent for each removed Spell Counter

This effect allows you to shut down a lot of decks that rely on the graveyard, including Invoked Shaddoll Dogmatika, Edlich, and so on

More specifically, the mechanic showed up on a lot of vampires and vampire-related cards in Shadows over Innistrad

Notably, TheAsianAvenger, of MTG Goldfish fame, played the deck to a lot of success in this early testing period

Another interesting thing is that dumping +1/+1 counters onto Animar turns it into a good beatstick

Using cards that let you Time Travel, for example, can keep the card around longer