Burakos, Party Leader, Haunted One, Relic of Legends, Merciless Executioner, and Retribution of the Ancients

Prerequisites

• Burakos, Party Leader on the battlefield
• Haunted One on the battlefield
• Relic of Legends on the battlefield
• Merciless Executioner in hand
• Retribution of the Ancients on the battlefield
• Burakos does not have a +1/+1 counter on it
• available

Steps

1. Cast Merciless Executioner by paying
2. When Merciless Executioner enters the battlefield, it triggers
3. Holding priority, activate Relic of Legends' second ability by tapping Burakos, adding
4. Burakos triggers, giving it and all creatures you control that share a creature type with it +2/+0 and undying until end of turn
5. Resolve the Merciless Executioner trigger from step 2, causing you to sacrifice Burakos, and each opponent to sacrifice a creature
6. When Burakos dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
7. Activate Retribution of the Ancients by paying and removing the +1/+1 counter from Burakos, giving Merciless Executioner -1/-1 until end of turn
8. Merciless Executioner dies as a state-based action due to having 0 toughness, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter from it
9. Repeat steps 2 through 6 one additional time
10. Activate Retribution of the Ancients by paying and removing the +1/+1 counter from Burakos and Merciless Executioner, giving Merciless Executioner -2/-2 until end of turn
11. Repeat from step 8

Results

• Each opponent sacrifices all creatures they control
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinitely powerful Orcs, Wizards, Warriors, Rogues, and Clerics except Burakos and Fleshbag Marauder until end of turn
• Infinite sacrifice triggers