Tombstone Stairwell + Vengeful Bloodwitch

Tombstone Stairwell

Vengeful Bloodwitch

How it works

1. At the beginning of each upkeep, Tombostone Stairwell's first ability triggers, causing each player to create a 2/2 Zombie creature token for each creature card in their graveyard.
2. At the beginning of each end step, Tombstone Stairwell's second ability triggers, destroying all tokens created by it.
3. When the token(s) die, Vengeful Bloodwitch triggers that many times, causing an opponent to lose that much life and you to gain that much life.
4. Repeat during each turn.