Scuttling Sliver + Trazyn the Infinite + Unnatural Selection + Thran Dynamo

Scuttling Sliver

Trazyn the Infinite

Unnatural Selection

Thran Dynamo

How it works

1. Activate Unnatural Selection by paying 1, causing Trazyn to become a Sliver until end of turn.
2. Activate Trazyn using Thran Dynamo's ability by tapping it, adding CCC.
3. Activate Trazyn by paying 2, untapping it.
4. Repeat from step 2.

By positioning Trazyn the Infinite alongside a Thran Dynamo in your graveyard, Trazyn inherits the dynamo's ability to tap for three colorless mana, leaving you with a net gain of one mana each time you untap it. The missing piece of this mechanical puzzle is Scuttling Sliver, whose activated untap ability is also absorbed by Trazyn due to its presence on the battlefield. Finally, Unnatural Selection plays the crucial role of a chameleon, allowing you to temporarily designate Trazyn as a Sliver so that the creature type matches the untap ability's requirement and sustains the infinite loop.