Voltaic Construct + Xenic Poltergeist + Everflowing Chalice

Voltaic Construct

Xenic Poltergeist

Everflowing Chalice

How it works

1. Animate Everflowing Chalice using Xenic Poltergeist.
2. Activate Everflowing Chalice by tapping it, adding at least CCC
3. Activate Voltaic Construct by paying 2, untapping Everflowing Chalice.
4. Repeat from step 2.

By turning Everflowing Chalice into an artifact creature with Xenic Poltergeist, you unlock a clever loop where the Chalice's mana production outpaces the cost to ready it. As long as the Chalice enters or has been kicked enough to tap for at least three mana, tapping it yields a surplus that easily pays for Voltaic Construct's activation fee. The Construct then untaps the animated Chalice, letting you repeat the process indefinitely to generate infinite colorless mana.