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.

Infinite damage

Ral, Storm Conduit

Cast an instant or sorcery spell, or wait for an opponent to cast one.
Holding priority, cast Cooperate from your graveyard by paying {2}{U}, targeting the spell.
Activate Rootha by paying {2} and returning it to your hand, copying Cooperate, with the copy targeting the original Cooperate.
Resolve the copy of Cooperate, copying Cooperate, targeting the original Cooperate.
Repeat step 4.

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