Arixmethes, Slumbering Isle + Training Grounds + Umbral Mantle

GU identity

Commander legal

The 3 combo pieces

• Arixmethes, Slumbering Isle
• Training Grounds
• Umbral Mantle

What must be in place

Arixmethes is a creaure and does not have summoning sickness.
Umbral Mantle attached to Arixmethes.

How to execute it

1. Activate Arixmethes by tapping it, adding {U}{G}.
2. Activate Arixmethes by paying {1} and untapping it, giving it +2/+2 until end of turn.
3. Repeat.

What the combo produces

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