Sevinne, the Chronoclasm | Refuse // Cooperate

Cards

({2} magic symbol) ({U} magic symbol) plus enough mana to cast the instant or sorcery from your hand available.

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