Errant, Street Artist + Reality Spasm + Thousand-Year Storm

Prerequisites

• You control at least two mana producing permanents, one of which can tap to produce at least .
• You've cast an instant or sorcery spell this turn.

Steps

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

Effects

• Infinite magecraft triggers
• Infinite mana permanents you control can produce