Scuttling Sliver + Trazyn the Infinite + Runed Stalactite + Coveted Jewel

Scuttling Sliver

Trazyn the Infinite

Runed Stalactite

Coveted Jewel

How it works

1. Activate Trazyn using Coveted Jewel's ability by tapping it, adding three mana of any color.
2. Activate Trazyn by paying 2, untapping it.
3. Repeat.

This elegant loop turns your graveyard into an engine for infinite colored mana by leveraging Trazyn the Infinite's ability to borrow text from artifacts in the scrap heap. With Coveted Jewel resting in your graveyard, Trazyn gains its mana-producing tap ability, while Runed Stalactite ensures Trazyn also counts as a Sliver to satisfy Scuttling Sliver's static ability. Because Scuttling Sliver grants every Sliver you control the ability to untap itself for two mana, Trazyn can repeatedly tap the Jewel's borrowed skill for three mana and pay two of it to untap, generating an endless surplus of colored mana.