Errant, Street Artist + Reality Spasm + Reverberate

Errant, Street Artist

Reality Spasm

Reverberate

How it works

1. Cast Reality Spasm by paying at least 3, targeting at least three permanents and choosing the untap mode.
2. Holding priority, cast Reverberate by paying its mana cost, copying Reality Spasm, targeting at least three permanents.
3. Holding priority, activate at least two mana-producing permanents you control by tapping them, adding at least 1.
4. Activate Errant by paying 1 and tapping it, copying the Reality Spasm copy, targeting Errant and at least two mana-producing permanents you control.
5. Resolve the copy of Reality Spasm from step 3, untapping Errant and at least two mana-producing permanents you control.
6. Repeat from step 3.

This clever loop puts Errant, Street Artist and Reverberate to work turning a single cast of Reality Spasm into an endless chain of untap triggers. By using Errant's ability to copy the spell already duplicated by Reverberate, you can continuously untap your own mana-producing permanents along with Errant itself to pay for the activation costs. Because Errant explicitly targets a spell that wasn't cast, it can safely keep copying the resulting spell copies indefinitely, flooding the stack with infinite magecraft triggers and generating infinite mana.