Requires

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 Phyrexian Altar by sacrificing the additional Human, Fungus and/or Pirate, adding one mana of any color.
5. When the creature dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
6. When the creature enters the battlefield, Intruder Alarm triggers, untapping all creatures.
7. Repeat.

Results