Turnabout, Twincast, and Izzet Guildmage

Prerequisites

• Turnabout in hand
• Twincast in hand
• Izzet Guildmage on the battlefield
• Lands that produce on the battlefield
• available

Steps

1. Cast Turnabout for
2. In response, Cast Twincast targeting Turnabout for
3. In response, Activate Izzet Guildmage's ability for targeting Twincast
4. Resolve the Izzet Guildmage's activated ability to copy Twincast targeting Turnabout with the copy of Twincast
5. Resolve the copy of Turnabout, created by the copy of Twincast to untap your lands that can produce at least
6. Repeat

Results

• Infinite colored mana
• Infinite colorless mana