Kiki-Jiki, Mirror Breaker + Phyrexian Altar + Lumbering Battlement

Kiki-Jiki, Mirror Breaker

Phyrexian Altar

Lumbering Battlement

How it works

1. Activate Kiki-Jiki by tapping it, creating a token copy of Lumbering Battlement.
2. When the Lumbering Battlement token enters the battlefield, it triggers, exiling Kiki-Jiki until Lumbering Battlement leaves the battlefield.
3. Activate Phyrexian Altar by sacrificing the Lumbering Battlement token.
4. When the Lumbering Battlement token dies, Kiki-Jiki is returned from exile to the battlefield.
5. Repeat.

This clever looping engine relies on Kiki-Jiki, Mirror Breaker's ability to duplicate nonlegendary creatures, turning its gaze toward Lumbering Battlement. As the Lumbering Battlement token enters, its triggered ability happily tucks Kiki-Jiki away into exile, which conveniently clears the board just in time for you to feed the Lumbering Battlement token to Phyrexian Altar for a mana of any color. Sacrificing the token causes it to die, immediately returning Kiki-Jiki back to the battlefield ready to repeat the cycle. Because Phyrexian Altar converts your sacrifices into fuel while Lumbering Battlement continuously rescues Kiki-Jiki from exile, you generate an endless loop of enters-the-battlefield and leaves-the-battlefield triggers alongside infinite colored mana.