Requires

Turnabout must be in hand. Twincast must be in hand. Izzet Guildmage must be on the battlefield. Lands that produce on the battlefield. Mana needed:

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