Waxmane Baku is a common Creature — Spirit card from Modern Masters 2015 (MM2), collector number 38. Current market price: $0.11 (foil $0.10), TCGplayer market prices via Scryfall.
Whenever you cast a Spirit or Arcane spell, you may put a ki counter on this creature. {1}, Remove X ki counters from this creature: Tap X target creatures.