Cruel Sadist is a rare Creature — Human Assassin card from Jumpstart 2022 (J22), collector number 391. Current market price: $0.28, TCGplayer market prices via Scryfall.
{B}, {T}, Pay 1 life: Put a +1/+1 counter on this creature. {2}{B}, {T}, Remove X +1/+1 counters from this creature: It deals X damage to target creature.