Errant, Street Artist + Reality Spasm + Bonus Round

Errant, Street Artist

Reality Spasm

Bonus Round

How it works

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

This loop transforms the cascade of copies generated by Bonus Round into an engine for infinite mana and magecraft triggers. Once Bonus Round establishes its spell-copying rule, casting Reality Spasm triggers a copy of the instant, allowing you to float mana and harness Errant, Street Artist to continuously copy and redirect the untap effect. By tapping and untapping your mana-producing permanents and Errant over and over, Errant's activated ability keeps the chain alive without ever needing to recast the original spells.