Scuttling Sliver + Trazyn the Infinite + Unnatural Selection + Coveted Jewel

Scuttling Sliver

Trazyn the Infinite

Unnatural Selection

Coveted Jewel

How it works

1. Activate Unnatural Selection by paying 1, causing Trazyn to become a Sliver until end of turn.
2. Activate Trazyn using Coveted Jewel's ability by tapping it, adding three mana of any color.
3. Activate Trazyn by paying 2, untapping it.
4. Repeat from step 2.

This clever loop transforms Trazyn the Infinite into an absolute engine by leveraging the passive graveyard access of Prismatic Gallery to harvest the abilities of artifacts in your graveyard—specifically, turning Coveted Jewel into a mana-producing machine right from your dead-pile. To make Trazyn eligible for Scuttling Sliver's untap ability, you use Unnatural Selection to dynamically rewrite Trazyn's creature type to Sliver for the turn. With the Sliver typing granted, Trazyn can repeatedly tap the Jewel's mana ability and then sink two of that mana back into Scuttling Sliver's untapping trick to stand back up, generating an infinite supply of colored mana.