Errant, Street Artist + Reality Spasm + Storm King's Thunder

Errant, Street Artist

Reality Spasm

Storm King's Thunder

How it works

1. Cast Storm King's Thunder by paying 1, copying the next instant or sorcery spell you cast once.
2. Cast Reality Spasm by paying at least 3, targeting at least three permanents and choosing the untap mode.
3. Storm King's Thunder 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.