Steward of the Harvest, Umbral Mantle, and Evendo, Waking Haven

Prerequisites

• Steward of the Harvest on the battlefield
• Umbral Mantle on the battlefield
• Evendo, Waking Haven in exile
• available

Steps

1. Activate the creature with Umbral Mantle attached using Evendo, Waking Haven's ability by paying and tapping it, adding at least Activate the creature by paying and tapping it, giving the creature +2/+2 until end of turn
2. Repeat

Results

• Infinite green mana
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce
• Infinitely large creature until end of turn