Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Morselhoarder + Ashnod's Altar

Decks

How it works

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If Morselhoarder has any -1/-1 counters on it, activate it by removing a -1/-1 counter from it, adding one mana of any color.
Repeat step 1 as necessary until Morselhoarder has no -1/-1 counters on it.
Activate Ashnod's Altar by sacrificing Morselhoarder.
When Morselhoarder dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
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.