Tombstone Stairwell, and Embalmed Ascendant

Prerequisites

• Tombstone Stairwell on the battlefield
• Embalmed Ascendant on the battlefield
• You have max speed

Steps

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, Embalmed Ascendant triggers that many times, causing each opponent to lose that much life and you to gain that much life
4. Repeat during each turn

Results

• Near-infinite lifegain
• Near-infinite lifeloss
• Near-infinite lifegain triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite death triggers