Steward of the Harvest, Sword of the Paruns, and Cabal Coffers

Prerequisites

• Steward of the Harvest on the battlefield
• Sword of the Paruns on the battlefield
• Cabal Coffers in exile
• available

Steps

1. Activate the creature with Sword of the Paruns attached using Cabal Coffers's ability by paying and tapping it, adding at least six
2. Activate Sword of the Paruns by paying , untapping the creature
3. Repeat

Results

• Infinite untap of creatures you control
• Infinite mana creatures you control can produce
• Infinite black mana