Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + White Widow, Free Agent + Yahenni, Undying Partisan

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

White Widow, Free Agent

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing White Widow.
2. When White Widow dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When White Widow enters, it triggers, putting a +1/+1 counter on it and up to one other creature.
4. Resolve the Yahenni ability.
5. Repeat.

This clever loop centers around Isilu, Carrier of Twilight's passive ability granting persist to your other nontoken creatures, allowing White Widow, Free Agent to bounce back from the graveyard with a -1/-1 counter whenever it dies. When White Widow re-enters the battlefield, its triggered ability places a +1/+1 counter on itself, which immediately neutralizes its -1/-1 counter through state-based actions so the cycle can repeat indefinitely. Meanwhile, Yahenni, Undying Partisan acts as the ultimate catalyst by providing both the free sacrifice outlet needed to start the loop and growing infinitely larger with every iteration from the resulting death triggers. Eirdu, Carrier of Dawn rounds out the package on the front side, giving your creature spells convoke while you set up your graveyard and board state before transforming.