Scuttling Sliver + Trazyn the Infinite + Unnatural Selection + Grim Monolith

Scuttling Sliver

Trazyn the Infinite

Unnatural Selection

Grim Monolith

How it works

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

This clever loop turns the graveyard into a powerhouse by relying on Trazyn the Infinite, whose *Prismatic Gallery* ability grants him the activated abilities of every artifact in your yard. With Grim Monolith sitting right there in the graveyard, Trazyn gains the ability to tap for three colorless mana, while Scuttling Sliver quietly bestows a universal `{2}: Untap this creature` ability to all Slivers you control. To bridge that gap, Unnatural Selection steps in to temporarily make Trazyn a Sliver, allowing him to endlessly untap himself using the Monolith's mana until you've generated an infinite supply of colorless power.