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.
Connect with Gollum at least once via Skulk to 'mark' each opponent, then spend the rest of the game gaining as much life as possible so your end step drains every marked opponent for that amount. You build a lifegain engine and stack big single-turn gains to deal lethal noncombat damage to the whole table at once.
Cheap 2-mana commander that can deal global, repeatable, non-combat damage to every opponent it has connected with
Skulk makes early hits reliable since most creatures have higher power
Turns lifegain (normally durdly) into a true win condition that hits the whole table simultaneously
Mono-black gives strong tutors, recursion, and life-payment payoffs
You must land combat damage on each opponent first, so a single chump or removal can lock one player out of the drain
Fragile 1/1 body that dies to nearly anything and resets the requirement when recast (the mark persists per-game once dealt, but removal stalls future damage)
Lifegain payoff is dead without a built lifegain engine, making the deck reliant on multiple pieces coming together
Vulnerable to lifegain hate and graveyard hate disrupting recursion
Legendary Creature — Halfling Horror
