Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Altar of Dementia + Nearheath Stalker

Decks

How it works

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Activate Altar of Dementia by sacrificing Nearheath Stalker
When Nearheath Stalker dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
Resolve the Altar of Dementia ability.
Activate Altar of Dementia by sacrificing Nearheath Stalker
When Nearheath Stalker dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Nearheath Stalker enters and dies as a state-based action due to having 0 toughness. Its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
Resolve the Altar of Dementia ability from step 4.
Repeat from step 4.

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.