Voltaic Construct + The Blackstaff of Waterdeep + Everflowing Chalice

Voltaic Construct

The Blackstaff of Waterdeep

Everflowing Chalice

How it works

1. Animate Everflowing Chalice using The Blackstaff of Waterdeep.
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.

To pull off this engine, you first need to use The Blackstaff of Waterdeep to animate Everflowing Chalice into an artifact creature, which is crucial because Voltaic Construct specifically requires an artifact creature target for its untap ability. Once the Chalice is suitably juiced up with charge counters from its multikicker to tap for at least three mana, you can tap it for your colorless resource, pay two of that mana into Voltaic Construct to untap the Chalice, and keep the leftover mana as profit. Repeating this loop yields infinite colorless mana and infinite untaps for your artifact creatures in formats like commander, legacy, modern, oathbreaker, and vintage.