Scuttling Sliver + Trazyn the Infinite + Amorphous Axe + Basalt Monolith

Scuttling Sliver

Trazyn the Infinite

Amorphous Axe

Basalt Monolith

How it works

1. Activate Trazyn using Basalt Monolith's ability by tapping it, adding CCC
2. Activate Trazyn by paying 2, untapping it.
3. Repeat.

This engine turns your graveyard into an absolute powerhouse by letting Trazyn the Infinite inherit the activated abilities of every artifact resting in your boneyard thanks to its Prismatic Gallery. With Basalt Monolith sitting safely in the graveyard, Trazyn gains its ability to tap for three colorless mana, while Amorphous Axe ensures Trazyn also counts as a Sliver creature by making it every creature type. That creature type grant allows Trazyn to leverage Scuttling Sliver's static ability, giving itself the two-mana untap ability needed to clear Basalt Monolith's self-untap restriction. By tapping for three and paying two to untap, you loop this sequence to generate infinite colorless mana with ease.