Emptiness + Phyrexian Altar + Mikey & Mona, Mutant Sitters

How it works

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Cast Emptiness for its evoke cost by paying .
When Emptiness enters, its first ability and evoke ability trigger.
Holding priority, activate Phyrexian Altar by sacrificing Emptiness, adding .
Resolve Emptiness's evoke trigger, failing to sacrifice it as it's no longer on the battlefield.
Resolve Emptiness's first trigger, returning Mikey & Mona from your graveyard to the battlefield.
When Mikey & Mona enters, it triggers, returning Emptiness from your graveyard to your hand.
Activate Phyrexian Altar by sacrificing Mikey & Mona, adding .
Repeat.

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

1–2 · Exhibition & Core

Allowed in this bracket.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.