Errant, Street Artist + Reality Spasm + Howl of the Horde

Prerequisites

• You control at least two mana producing permanents, one of which can tap to produce at least .

Steps

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

Effects

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