Kiki-Jiki, Mirror Breaker + Return the Favor + Dualcaster Mage

Kiki-Jiki, Mirror Breaker

Return the Favor

Dualcaster Mage

How it works

1. Activate Kiki-Jiki by tapping it, targeting any nonlegendary creature you control.
2. Holding priority, cast Return the Favor by paying 1, choosing its first mode, targeting Kiki-Jiki's ability.
3. Holding priority, cast Dualcaster Mage by paying 1.
4. When Dualcaster Mage enters the battlefield, it triggers, copying Return the Favor, targeting Kiki-Jiki's ability.
5. Resolve the copy of Return the Favor, copying Kiki-Jiki's ability, targeting Dualcaster Mage.
6. Resolve the copy of Kiki-Jiki's ability, creating a token copy of Dualcaster Mage with haste.
7. Repeat from step 4.

This clever loop starts by using Kiki-Jiki, Mirror Breaker to target any nonlegendary creature, then hijacking that very activation with Return the Favor to set the stage. When you drop Dualcaster Mage into the mix, its entry trigger copies Return the Favor, allowing you to repeatedly copy Kiki-Jiki's ability and target Dualcaster Mage itself for endless recursion. Because Kiki-Jiki's haste-granting copies of Dualcaster Mage instantly enter and restart the chain, you get an endless supply of triggers and tokens.