Bigger on the Inside + Pemmin's Aura

GUR identity

Commander legal

The 2 combo pieces

• Bigger on the Inside
• Pemmin's Aura

How to execute it

1. Activate the creature with Bigger on the Inside and Pemmin's Aura attached by tapping it, adding {U}{U} and causing the next spell you cast this turn to have cascade.
2. Activate Pemmin's Aura by paying {U}, untapping the creature.
3. Repeat.

What the combo produces

• Infinite cascade with mana value equal to the next spell you cast
• Infinite colored mana