Vraska, Swarm's Eminence is a uncommon Legendary Planeswalker — Vraska card from War of the Spark (WAR), collector number 236. Current market price: $0.30 (foil $0.64), TCGplayer market prices via Scryfall.
Whenever a creature you control with deathtouch deals damage to a player or planeswalker, put a +1/+1 counter on that creature. −2: Create a 1/1 black Assassin creature token with deathtouch and "Whenever this token deals damage to a planeswalker, destroy that planeswalker."