Darien, King of Kjeldor + Pandemonium + Cloudsteel Kirin

Darien, King of Kjeldor

Pandemonium

Cloudsteel Kirin

How it works

1. Cause a creature to enter the battlefield under your control.
2. Pandemonium triggers, dealing damage to you equal to the creature's power, with you being unable to lose the game due to Cloudsteel Kirin.
3. Darien triggers, creating a number of 1/1 Soldier creature tokens equal to the damage dealt to you.
4. When the Soldiers enter the battlefield, Pandemonium triggers that many times.
5. Resolve the first trigger, dealing 1 damage to you, with you being unable to lose the game due to Cloudsteel Kirin.
6. Repeat from step 3.

This ingenious setup turns self-inflicted damage into an endless recursive engine, protected entirely by Cloudsteel Kirin ensuring you can never lose the game no matter how much damage you take. It all kicks off when any creature enters the battlefield, letting Pandemonium deal damage straight to your own face. That blow triggers Darien, King of Kjeldor to flood your board with 1/1 Soldier creature tokens equal to the damage taken. Every single one of those newly arriving tokens then feeds right back into Pandemonium, continuing the cycle and generating infinite creature tokens and infinite creature ETB triggers without end.