Blademane Baku is a common Creature — Spirit card from Betrayers of Kamigawa (BOK), collector number 95. Current market price: $0.18 (foil $0.40), 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: For each counter removed, this creature gets +2/+0 until end of turn.