Magus of the Coffers, and Umbral Mantle

Prerequisites

• Magus of the Coffers on the battlefield
• Umbral Mantle on the battlefield
• Magus of the Coffers is not summoning sick and can tap for mana
• At least six Swamps under your control
• to start the combo

Steps

1. Attach Umbral Mantle to Magus of the Coffers
2. Pay to activate Magus of the Coffers, adding at least six
3. Pay to activate Umbral Mantle, untapping Magus of the Coffers
4. Repeatedly tap the Magus for mana and untap it, generating at least per iteration

Results

• Infinite black mana