Blistergrub is a common Creature — Phyrexian Horror card from Scars of Mirrodin (SOM), collector number 56. Current market price: $0.22 (foil $0.46), 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.