Black Market, Strionic Resonator, Clever Conjurer, and Umbral Mantle

Prerequisites

• Black Market on the battlefield
• Strionic Resonator on the battlefield
• Clever Conjurer on the battlefield
• Umbral Mantle on the battlefield
• Black Market has at least six charge counters on it
• Umbral Mantle attached to Clever Conjurer
• Clever Conjurer 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 Strionic Resonator 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 Clever Conjurer by tapping it, untapping Lithoform Engine
5. Activate Clever Conjurer by paying and untapping it, giving it +2/+2 until end of turn
6. Repeat from step 2

Results

• Infinite black mana
• Infinitely large Clever Conjurer 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