Goblin Bombardment + Dualcaster Mage + Graceful Reprieve

Decks

How it works

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Cast Graceful Reprieve by paying its mana cost.
Holding priority, cast Dualcaster Mage by paying its mana cost.
When Dualcaster Mage enters, it triggers, copying Graceful Reprieve, with the copy targeting Dualcaster Mage.
Resolve the copy of Graceful Reprieve.
Holding priority, activate Goblin Bombardment by sacrificing Dualcaster Mage.
When Dualcaster Mage dies, Graceful Reprieve triggers, returning Dualcaster Mage from your graveyard to the battlefield.
Repeat from step 3.
Resolve all Goblin Bombardment abilities from step 5.

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.