Steward of the Harvest, Singing Bell Strike, and Gaea's Cradle

Prerequisites

• Steward of the Harvest on the battlefield
• Singing Bell Strike on the battlefield
• Gaea's Cradle in exile

Steps

1. Activate the creature with Singing Bell Strike attached using Gaea's Cradle's ability by tapping it, adding at least seven
2. Activate Singing Bell Strike by paying , untapping the creature
3. Repeat

Results

• Infinite green mana