Xavier Sal, Infested Captain + Haunted One + Hyrax Tower Scout + Bartolomé del Presidio
Xavier Sal, Infested Captain
Haunted One
Hyrax Tower Scout
Bartolomé del Presidio
Infinite creature LTBInfinite creature ETBInfinite creature sacrifice triggersInfinite death triggersInfinite +1/+1 counters on a creatureInfinite copies of creature tokens you controlInfinite power for certain creatures until end of turn
How it works
Activate Xavier Sal's first ability by tapping it and removing a +1/+1 counter from Hyrax Tower Scout if it has one, or any counter from another permanent you control otherwise.
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.
Resolve the Xavier Sal ability, causing you to populate.
Activate Bartolomé del Presidio by sacrificing Hyrax Tower Scout.
When Hyrax Tower Scout dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
When Hyrax Tower Scout enters the battlefield, it triggers, untapping Xavier Sal.
Resolve the Bartolomé del Presidio ability, putting a +1/+1 counter on it.