Lutri, the Spellchaser + Sami, Wildcat Captain + Airbender's Reversal

Lutri, the Spellchaser

Sami, Wildcat Captain

Airbender's Reversal

How it works

1. Cast Airbender's Reversal by paying its mana cost reduced by Sami, targeting any applicable target(s).
2. Holding priority, cast Lutri by paying its mana cost reduced by Sami.
3. When Lutri enters, it triggers, copying Airbender's Reversal targeting Lutri.
4. Resolve Airbender's Reversal, airbending Lutri.
5. Holding priority, cast Lutri from exile by paying 0 due to Sami.
6. Repeat from step 3.

This crafty loop turns Sami, Wildcat Captain into a ridiculous engine by using its artifact affinity to make your spells essentially free. You cast Airbender's Reversal, then flash in Lutri, the Spellchaser so its cast trigger copies the Reversal and targets Lutri itself. When the copy resolves, Airbender's Reversal exiles Lutri, allowing you to recast it for free thanks to Sami's cost reduction. Because Lutri re-enters the battlefield to copy the spell all over again, you get an endless chain of entering and leaving the battlefield alongside infinite magecraft and storm triggers.