Cast any instant or sorcery spell.
Holding priority, cast Cooperate from your graveyard by paying {2}{U}.
Sevinne triggers, creating a copy of Cooperate, targeting Cooperate.
Resolve the copy of Cooperate, creating a copy of Cooperate, targeting Cooperate.
Repeat step 4.

Infinite magecraft triggers

Sevinne, the Chronoclasm

Refuse // Cooperate

Cast the spell in your hand.
In response cast Refuse // Cooperate from your graveyard to copy it.
Sevinne, the Chronoclasm's ability triggers copying Refuse // Cooperate.
Copy the original Refuse // Cooperate.
Repeat.
For each copy made Ral, Storm Conduit will trigger dealing 1 damage to an opponent.

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