Kiki-Jiki, Mirror Breaker + Mardu Siegebreaker + Phantom Train

Kiki-Jiki, Mirror Breaker

Mardu Siegebreaker

Phantom Train

How it works

1. Activate Kiki-Jiki by tapping it, creating a token copy of Mardu Siegebreaker.
2. When the Mardu Siegebreaker token enters the battlefield, it triggers, exiling Kiki-Jiki until Mardu Siegebreaker leaves the battlefield.
3. Activate Phantom Train by sacrificing the Mardu Siegebreaker token.
4. When the Mardu Siegebreaker token dies, Kiki-Jiki is returned from exile to the battlefield.
5. Resolve the Phantom Train ability.
6. Repeat.

This clever loop revolves around Kiki-Jiki, Mirror Breaker's ability to repeatedly clone Mardu Siegebreaker, whose enters-the-battlefield trigger neatly tucks Kiki-Jiki safely into exile. To keep the engine running, Phantom Train steps in as a reliable sacrifice outlet, converting the Mardu Siegebreaker token into a +1/+1 counter on itself while immediately returning Kiki-Jiki to the battlefield to do it all over again.