Gollum, Obsessed Stalker (Showcase Scrolls) (LTC-428) - Tales of Middle-earth Commander: (Showcase) Foil

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.