Scuttling Sliver + Trazyn the Infinite + Amoeboid Changeling + Thran Dynamo

Scuttling Sliver

Trazyn the Infinite

Amoeboid Changeling

Thran Dynamo

How it works

1. Activate Amoeboid Changeling by tapping it, causing Trazyn to become a Sliver until end of turn.
2. Activate Trazyn using Thran Dynamo's ability by tapping it, adding CCC.
3. Activate Trazyn by paying 2, untapping it.
4. Repeat from step 2

This clever loop turns your graveyard and battlefield into an infinite mana engine by exploiting Trazyn the Infinite's ability to borrow activated text from the dead. With Thran Dynamo waiting in the graveyard to provide a massive three-mana return whenever its ability is borrowed, and Scuttling Sliver's untap power also copied by Trazyn, you have all the raw components needed for a loop. The missing link is Amoeboid Changeling, whose tap ability makes Trazyn a Sliver, immediately unlocking the Sliver-specific untap text from Scuttling Sliver so Trazyn can untap itself for just two generic mana. By funneling the mana produced by Thran Dynamo back into Scuttling Sliver's untap cost, Trazyn generates infinite colorless mana.