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

Decks

How it works

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

In which brackets is this combo allowed, per Spellbook's Spicy tier?

1–2 · Exhibition & Core

Spellbook classifies this as Spicy — not for these brackets.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.