Swarm Intelligence + Reiterate

Swarm Intelligence

Reiterate

How it works

1. Cast any instant or sorcery spell, or wait for an opponent to cast one.
2. Holding priority, cast Reiterate by paying 1, 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.

This loop turns any spell cast into an endless engine of magical duplication by pairing a passive amplifier with a self-sustaining spell. When you cast your initial spell, Reiterate targets it, while Swarm Intelligence watches from the battlefield and generously copies whatever instant or sorcery you put on the stack. Because the copy of Reiterate targets the original Reiterate, you can loop the process indefinitely without even needing its buyback cost—creating infinite magecraft triggers to overwhelm your opponents.