Steward of the Harvest + Tolarian Academy + Umbral Mantle

GU identity

The 3 combo pieces

• Steward of the Harvest
• Tolarian Academy
• Umbral Mantle

What must be in place

You control at least three artifacts.

How to execute it

1. Activate the creature with Umbral Mantle attached using Tolarian Academy's ability by tapping it, adding at least {U}{U}{U}.
2. Activate the creature by paying {3} and untapping it, giving it +2/+2 until end of turn.
3. Repeat.

What the combo produces

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