The Master, Multiplied + Kiki-Jiki, Mirror Breaker + Izzet Chemister + Walk the Aeons

The Master, Multiplied

Kiki-Jiki, Mirror Breaker

Izzet Chemister

Walk the Aeons

How it works

1. Cast Walk the Aeons by paying 4, causing you to take an extra turn after this one.
2. Activate Kiki-Jiki by tapping it, creating a token copy of Izzet Chemister.
3. Activate the Izzet Chemister token's first ability by paying and tapping it, exiling Walk the Aeons from your graveyard.
4. At the beginning of your end step, Kiki-Jiki triggers, but you cannot sacrifice the Izzet Chemister token due to The Master.
5. On your next turn, activate the Izzet Chemister token's last ability by paying 1, tapping it, and sacrificing it, casting the exiled spell without paying its mana cost.
6. Resolve that spell, causing you to take an extra turn after this one.
7. Repeat from step 2.

This ingenious loop achieves infinite turns by turning a temporary copy into a permanent engine. Kiki-Jiki, Mirror Breaker generates a token copy of Izzet Chemister, which then uses its first ability to exile Walk the Aeons from your graveyard. Normally, that token would perish at the end step, but The Master, Multiplied applies its vital static protection to completely shut down token sacrifice and exile triggers. This allows the Izzet Chemister token to survive until your next turn, where you finally sacrifice it via its second ability to cast the exiled Walk the Aeons for free and start the sequence over again.