Gollum, Obsessed Stalker is a rare Legendary Creature — Halfling Horror card from Tales of Middle-earth Commander (LTC), collector number 109. Current market price: $2.29, TCGplayer market prices via Scryfall.
Skulk (This creature can't be blocked by creatures with greater power.) At the beginning of your end step, each opponent dealt combat damage this game by a creature named Gollum, Obsessed Stalker loses life equal to the amount of life you gained this turn.