Aphetto Alchemist, Umbral Mantle, and Chromatic Orrery

Prerequisites

• Aphetto Alchemist on the battlefield
• Umbral Mantle on the battlefield
• Chromatic Orrery on the battlefield
• Umbral Mantle attached to Aphetto Alchemist
• Aphetto Alchemist does not have summoning sickness

Steps

1. Activate Chromatic Orrery's first ability by tapping it, adding
2. Activate Aphetto Alchemist by tapping it, untapping Chromatic Orrery
3. Activate Aphetto Alchemist by paying and untapping it, giving it +2/+2 until end of turn
4. Repeat
5. Once you have infinite mana, you may instead use Chromatic Orrery's second ability to draw infinite cards

Results

• Infinite card draw
• Infinite colored mana
• Infinite colorless mana
• Infinite draw triggers
• Infinitely large Aphetto Alchemist until end of turn
• Infinite untap of artifacts and creatures you control