Scuttling Sliver + Trazyn the Infinite + Amoeboid Changeling + Mana Vault

Scuttling Sliver

Trazyn the Infinite

Amoeboid Changeling

Mana Vault

How it works

1. Activate Amoeboid Changeling by tapping it, 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 clever loop lets Trazyn the Infinite generate an infinite supply of colorless mana by turning into a Sliver with the help of Amoeboid Changeling. Once Amoeboid Changeling grants Trazyn all creature types, Prismatic Gallery allows Trazyn to access the activated abilities of any artifacts sitting in your graveyard—specifically harnessing Mana Vault for its explosive three-mana tap ability. By feeding just two of that generated mana back into Scuttling Sliver's untap ability (which Trazyn also inherits), you untap Trazyn to repeat the process endlessly.