Activate Bartolomé del Presidio by sacrificing the persist or undying creature.
When the creature dies, its persist or undying ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter or a +1/+1 counter on it due to Solemnity.
Resolve the Bartolomé del Presidio ability.
Repeat.

Infinite LTB

Infinite ETB

Infinite sacrifice triggers

Infinite death triggers

Infinite +1/+1 counters on a creature

Creature with Persist or Undying

Solemnity

Bartolomé del Presidio

Activate Bartolomé del Presidio by sacrificing another nontoken creature without a -1/-1 counter on it.
When the creature dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Solemnity.
Resolve the Bartolomé del Presidio ability.
Repeat.

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Activate Bartolomé del Presidio by sacrificing a creature without flying.
When the creature dies, Luminous Broodmoth triggers, returning the creature from your graveyard to the battlefield without a flying counter on it due to Solemnity.
Resolve the Bartolomé del Presidio ability.
Repeat.

Luminous Broodmoth

Activate Bartolomé del Presidio by sacrificing Unstoppable Slasher.
When Unstoppable Slasher dies, its second ability triggers, returning it from your graveyard to the battlefield with zero stun counters due to Solemnity.
Resolve the Bartolomé del Presidio ability
Repeat.

Unstoppable Slasher

Cast Rhys by paying {1}{W}
When Rhys enters, it triggers, giving Reveillark persist until end of turn.
Activate Bartolomé del Presidio by sacrificing Rhys.
Activate Bartolomé del Presidio by sacrificing Reveillark.
When Reveillark dies, its ability and its persist ability trigger.
Resolve the persist trigger, returning Reveillark from your graveyard to the battlefield without a -1/-1 counter on it due to Solemnity.
Resolve the second trigger, returning Rhys from your graveyard to the battlefield.
When Rhys enters, it triggers, giving Reveillark persist until end of turn.
Resolve the Bartolomé del Presidio ability from step 4.
Repeat from step 3.

Rhys, the Evermore

Reveillark

Cast Chronozoa by paying {3}{U}. It will enter without a time counter on it due to Solemnity.
Activate Bartolomé del Presidio by sacrificing Chronozoa.
When Chronozoa dies, it triggers, creating two token copies of itself that also enter with no time counters on them due to Solemnity.
Resolve the Bartolomé del Presidio ability.
Repeat from step 2 using a token copy of Chronozoa instead.

Infinite creature tokens

Chronozoa

Activate Bartolomé del Presidio by sacrificing a Villain without a finality counter on it.
When the Villain dies, Thunderbolts Conspiracy triggers, returning it from your graveyard to the battlefield without a finality counter on it due to Solemnity.
Resolve the Bartolomé del Presidio ability.
Repeat.

Villain Creature

Thunderbolts Conspiracy

Activate Bartolomé del Presidio by sacrificing Shield Sphere.
Cast Shield Sphere from your graveyard by paying {0}. It will not enter with a finality counter on it due to Solemnity.
Repeat.

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