Black Market, Lithoform Engine, Aphetto Alchemist, and Umbral Mantle

Prerequisites

• Black Market on the battlefield
• Lithoform Engine on the battlefield
• Aphetto Alchemist on the battlefield
• Umbral Mantle on the battlefield
• Black Market has at least six charge counters on it
• Umbral Mantle attached to Aphetto Alchemist
• Aphetto Alchemist does not have summoning sickness
• available

Steps

1. At the beginning of your precombat main phase, Black Market's second ability triggers
2. Holding priority, activate Lithoform Engine's first ability by paying and tapping it, copying Black Market's trigger
3. Resolve the copy of Black Market's trigger, adding at least six
4. Activate Aphetto Alchemist by tapping it, untapping Lithoform Engine
5. Activate Aphetto Alchemist by paying and untapping it, giving it +2/+2 until end of turn
6. Repeat from step 2

Results

• Infinite black mana
• Infinitely large Aphetto Alchemist until end of turn
• Infinite mana artifacts you control can produce
• Infinite mana creatures you control can produce
• Infinite untap of artifacts you control
• Infinite untap of creatures you control