Kadena's Silencer is a rare Creature — Snake Wizard card from Commander 2019 (C19), collector number 8. Current market price: $0.34, TCGplayer market prices via Scryfall.
When this creature is turned face up, counter all abilities your opponents control. Megamorph {1}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)