Rune-Brand Juggler is a uncommon Creature — Human Shaman card from Murders at Karlov Manor (MKM), collector number 229. Current market price: $0.06 (foil $0.02), TCGplayer market prices via Scryfall.
When this creature enters, suspect up to one target creature you control. (A suspected creature has menace and can't block.) {3}{B}{R}, Sacrifice a suspected creature: Target creature gets -5/-5 until end of turn.