The Chain Veil, Ashnod's Altar, Aphetto Alchemist, Intruder Alarm, and Chandra, Flamecaller

Prerequisites

• The Chain Veil on the battlefield
• Ashnod's Altar on the battlefield
• Aphetto Alchemist on the battlefield
• Intruder Alarm on the battlefield
• Chandra, Flamecaller on the battlefield
• Aphetto Alchemist does not have summoning sickness

Steps

1. Activate Chandra's first loyalty ability by putting a loyalty counter on it, creating two 3/1 Elemental creature tokens with haste
2. When the Elementals enter the battlefield, Intruder Alarm triggers twice
3. Resolve the first trigger, untapping all creatures
4. Activate Aphetto Alchemist by tapping it, untapping The Chain Veil
5. Resolve the second Intruder Alarm trigger, untapping all creatures
6. Activate Aphetto Alchemist by tapping it, untapping target artifact or creature
7. Activate Ashnod's Altar twice by sacrificing the two Elemental tokens, adding
8. Activate The Chain Veil by paying and tapping it, allowing you an additional activation of your planeswalkers' loyalty abilities this turn
9. Repeat

Results

• Infinite activations of loyalty abilities of all other Planeswalkers you control
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana artifacts you control can produce
• Infinite mana creatures you control can produce
• Infinite sacrifice triggers
• Infinite untap of all creatures
• Infinite untap of artifacts you control