Blistergrub is a common Creature — Phyrexian Horror card from Duel Decks: Nissa vs. Ob Nixilis (DDR), collector number 40. Current market price: $0.25, TCGplayer market prices via Scryfall.
Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.) When this creature dies, each opponent loses 2 life.