Scuttling Sliver + Trazyn the Infinite + The Eternity Elevator + Amoeboid Changeling

Scuttling Sliver

Trazyn the Infinite

The Eternity Elevator

Amoeboid Changeling

How it works

1. Activate Amoeboid Changeling by tapping it, causing Trazyn to become a Sliver until end of turn.
2. Activate Trazyn using The Eternity Elevator'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 powerful engine, relying on Trazyn the Infinite to absorb the activated abilities of artifact cards resting in your graveyard. By using Amoeboid Changeling to temporarily grant Trazyn all creature types, it becomes a Sliver, which endows Trazyn with Scuttling Sliver's untap ability. Once Trazyn has gained the mana-producing capabilities of The Eternity Elevator from the graveyard, you can repeatedly tap the artifact for three colorless mana and pay two mana to untap it, generating an infinite supply of colorless mana.