Scuttling Sliver + Trazyn the Infinite + Amoeboid Changeling + Timeless Lotus

Scuttling Sliver

Trazyn the Infinite

Amoeboid Changeling

Timeless Lotus

How it works

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

This ingenious engine hinges on Trazyn the Infinite absorbing the activated abilities of artifact cards in your graveyard, specifically adopting the five-color mana-producing capability of a discarded Timeless Lotus. To make this work, Amoeboid Changeling steps in with its type-changing utility to grant Trazyn the Sliver creature type, allowing Trazyn to access the untap ability granted passively to all Slivers by Scuttling Sliver. With Trazyn now able to tap for a rainbow of mana and pay two mana to untap itself using the Sliver-gained ability, you have a self-contained infinite mana loop.