Portent Tracker, Pemmin's Aura, and Rikala, Homarid King

Prerequisites

• Portent Tracker on the battlefield
• Pemmin's Aura on the battlefield
• Rikala, Homarid King on the battlefield
• available

Steps

1. Activate an Island by tapping it, adding
2. Rikala triggers, adding
3. Activate Portent Tracker by tapping it, untapping the Island
4. Activate Pemmin's Aura by paying , untapping Portent Tracker
5. Repeat from step 1

Results

• Infinite blue mana
• Infinite mana lands you control can produce
• Infinite untap of lands you control