Emmara, Soul of the Accord, Intruder Alarm, Grand Architect, and Painter's Servant

Prerequisites

• Emmara, Soul of the Accord on the battlefield
• Intruder Alarm on the battlefield
• Grand Architect on the battlefield
• Painter's Servant on the battlefield
• "Blue" chosen with Painter's Servant

Steps

1. Activate Grand Architect's second ability by tapping Emmara, adding that can only be spent to cast artifact spells and/or to activate abilities of artifacts
2. Emmara triggers, creating a 1/1 Soldier creature token
3. When the Soldier enters the battlefield, Intruder Alarm triggers, untapping all creatures
4. Repeat from step 2

Results

• Infinite colorless mana that can only be spent to activate abilities of artifacts
• Infinite colorless mana that can only be spent to cast artifact spells
• Infinite creature tokens
• Infinite ETB
• Infinite mana creatures you control can produce
• Infinite untap of all creatures