Haunted One
Intruder Alarm
Phyrexian Altar
Xavier Sal, Infested Captain

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.
Xavier Sal must be your commander.
There is at least one counter on a permanent you control except Xavier Sal. Xavier Sal does not have summoning sickness. You control at least one additional nontoken Human, Fungus and/or Pirate that has no more than one +1/+1 counter on it.

   Steps

How does this combo work?
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

What do I get from this combo?
Infinite LTB
Infinite ETB
Infinite colored mana
Infinite sacrifice triggers
Infinite death triggers
Infinite untap of creatures
Infinite mana creatures you control can produce
Infinite power for certain creatures until end of turn
Infinite untap of creatures you control
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