Mortuary + Bartolomé del Presidio + Tarpan + Gwenom, Remorseless

Mortuary

Bartolomé del Presidio

Tarpan

Gwenom, Remorseless

How it works

1. Activate Bartolomé del Presidio by sacrificing Tarpan.
2. When Tarpan dies, it and Mortuary triggers.
3. Resolve the Mortuary trigger, putting Tarpan from your graveyard onto the top of your library.
4. Resolve the Tarpan trigger, causing you to gain 1 life
5. Resolve the Bartolomé del Presidio ability.
6. Cast Tarpan from the top of your library by paying 1 life due to Gwenom.
7. Repeat.

This crafty loop revolves around Mortuary, which ensures that whenever Tarpan hits the graveyard, it seamlessly returns right back to the top of your library instead. Bartolomé del Presidio acts as the sacrifice outlet that triggers this cycle while growing larger with each iteration. Meanwhile, Gwenom, Remorseless provides the crucial alternate casting engine, letting you bypass traditional mana costs so you can repeatedly deploy Tarpan directly from your library by paying life. That life loss is completely offset by the life you gain when Tarpan dies, creating a self-sustaining loop that generates infinite death triggers and counters.