Xavier Sal, Infested Captain, Haunted One, Thornbite Staff, and Ashnod's Altar

Prerequisites

• Xavier Sal, Infested Captain on the battlefield
• Haunted One on the battlefield
• Thornbite Staff on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Xavier Sal's first ability by tapping it and removing a +1/+1 counter from the additional nontoken Human, Fungus and/or Pirate if it has one, or any counter from another permanent you control otherwise
2. Xavier Sal triggers, causing it and all other creatures you control that share a creature type with it to get +2/+0 and gain undying until end of turn
3. Resolve the Xavier Sal ability, causing you to populate
4. Activate Ashnod's Altar by sacrificing the additional Human, Fungus and/or Pirate, adding
5. When the creature dies, its undying ability and Xavier Sal trigger
6. Resolve the creature's undying trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it
7. Resolve the Xavier Sal trigger, untapping it
8. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite colorless mana
• Infinitely powerful Humans, Fungi and Pirates you control until end of turn