Morophon, the Boundless + Stonecloaker + Jodah, Archmage Eternal

Morophon, the Boundless

Stonecloaker

Jodah, Archmage Eternal

How it works

1. Cast Stonecloaker by paying 0.
2. When Stonecloaker enters, it triggers, returning itself from the battlefield to your hand.
3. Repeat.

This ingenious loop relies on Jodah, Archmage Eternal, whose ability lets you cast spells for a flat five-color mana cost instead of their printed mana cost. With Morophon, the Boundless naming the chosen creature type, its static cost-reduction ability chips away exactly {W}{U}{B}{R}{G} from any spell of that type—which completely zeroes out the mana cost Jodah demands! This turns Stonecloaker into a free cast from your hand, triggering its own enter-the-battlefield ability to immediately bounce itself right back to your hand so you can repeat the process indefinitely.