Requires

Sevinne, the Chronoclasm must be on the battlefield. Refuse // Cooperate must be in the graveyard. You have an instant or sorcery card in hand. Mana needed: plus enough mana to cast the instant or sorcery from your hand

Steps

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

Results