Scuttling Sliver + Trazyn the Infinite + Mana Vault + Trickery Charm

Scuttling Sliver

Trazyn the Infinite

Mana Vault

Trickery Charm

How it works

1. Cast Trickery Charm by paying , causing Trazyn to become a Sliver until end of turn.
2. Activate Trazyn using Mana Vault's ability by tapping it, adding CCC
3. Activate Trazyn by paying 2, untapping it.
4. Repeat from step 2.

This engine relies on Trazyn the Infinite absorbing the activated abilities of artifacts in your graveyard, specifically the mana-generating power of Mana Vault. Since Mana Vault doesn't naturally untap during your untap step, you use Trickery Charm to temporarily turn Trazyn into a Sliver, which grants him the untap ability printed on Scuttling Sliver. By tapping Trazyn for three colorless mana and then paying two of them to untap him using Scuttling Sliver's newly acquired text, you can loop this process indefinitely to generate an infinite supply of colorless mana.