Filigree Sages + Prototype Portal + Tanglepool Bridge + Tiller Engine + Training Grounds

Filigree Sages

Prototype Portal

Tanglepool Bridge

Tiller Engine

Training Grounds

How it works

1. Activate Prototype Portal by paying 0 and tapping it, creating a token copy of Tanglepool Bridge.
2. When Tanglepool Bridge enters the battlefield, Tiller Engine triggers, untapping it.
3. Activate the Tanglepool Bridge token by tapping it, adding .
4. Activate Filigree Sages by paying , untapping Prototype Portal.
5. Repeat.

This engine relies on turning a land into a self-replicating artifact using Prototype Portal, with Tanglepool Bridge chosen as the imprinted card because its mana value of zero allows the Portal to copy it for free. Training Grounds is crucial here because it reduces the activation cost of Filigree Sages from {2}{U} down to {1}{U}, ensuring you net extra blue mana each cycle from the Tanglepool Bridge token's tap ability. Whenever that token enters the battlefield, Tiller Engine's static trigger steps in to automatically untap it, and Filigree Sages uses your floating mana to untap Prototype Portal so the loop can begin anew.