Delighted Halfling + Kinnan, Bonder Prodigy + Pemmin's Aura

GU identity

Commander legal

The 3 combo pieces

• Delighted Halfling
• Kinnan, Bonder Prodigy
• Pemmin's Aura

How to execute it

1. Activated Delighted Halfling by tapping it, adding {U} that can only be spent to cast legendary spells.
2. Kinnan triggers, adding {U}.
3. Activate Pemmin's Aura by paying {U}, untapping Delighted Halfling.
4. Repeat.

What the combo produces

• Infinite colored mana that can only be spent to cast legendary spells