Kappa Cannoneer is a rare Artifact Creature — Turtle Warrior card from Murders at Karlov Manor Commander (MKC), collector number 108. Current market price: $0.88, TCGplayer market prices via Scryfall.
Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.) Ward {4} Whenever this creature or another artifact you control enters, put a +1/+1 counter on this creature. It can't be blocked this turn.