Swarm Intelligence + Reiterate

Prerequisites

If desired, you have another instant or sorcery card in hand with mana to cast it.

Steps

1. Cast any instant or sorcery spell, or wait for an opponent to cast one.
2. Holding priority, cast Reiterate by paying {1}{R}{R}, targeting the spell.
3. Swarm Intelligence triggers, copying Reiterate, targeting the original Reiterate.
4. Resolve the copy of Reiterate, copying Reiterate targeting the original Reiterate.
5. Repeat step 4.