Emry, Lurker of the Loch, Mirran Spy, and Lotus Petal

Prerequisites

• Emry, Lurker of the Loch on the battlefield
• Mirran Spy on the battlefield
• Lotus Petal in the graveyard

Steps

1. Activate Emry by tapping it, targeting Lotus Petal
2. Cast Lotus Petal from your graveyard by paying
3. Mirran Spy triggers, untapping Emry
4. Activate Lotus Petal by sacrificing it
5. Repeat

Results

• Infinite colored mana
• Infinite storm count