Sewer Shambler is a common Creature — Zombie card from Return to Ravnica (RTR), collector number 75. Current market price: $0.14 (foil $0.40), TCGplayer market prices via Scryfall.
Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.) Scavenge {2}{B} ({2}{B}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)