Kiki-Jiki, Mirror Breaker + Blazing Firesinger // Seething Song + Hematite Talisman + Archmage of Runes

How it works

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Activate Kiki-Jiki by tapping it, copying Blazing Firesinger. It'll enter prepared due to its effect.
Cast a copy of Seething Song by paying due to Archmage of Runes.
Archmage of Ruins and Hematite Talisman trigger.
Resolve the Archmage of Ruins trigger, causing you to draw a card.
Resolve the Hematite Talisman trigger, causing you to pay to untap Kiki-Jiki.
Resolve Seething Song, 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.