Steward of the Harvest, Gauntlets of Light, and Serra's Sanctum

Prerequisites

• Steward of the Harvest on the battlefield
• Gauntlets of Light on the battlefield
• Serra's Sanctum in exile

Steps

1. Activate the creature with Gauntlets of Light attached using Serra's Sanctum's ability by tapping it, adding at least Activate Gauntlets of Light by paying , untapping the creature
2. Repeat

Results

• Infinite white mana