Voltaic Construct + Palladium Myr + Training Grounds

Voltaic Construct

Palladium Myr

Training Grounds

How it works

1. Activate Palladium Myr by tapping it, adding CC.
2. Activate Voltaic Construct by paying 1, untapping Palladium Myr.
3. Repeat.

This tidy two-card loop transforms a simple mana producer into an engine for infinite activations. With Training Grounds reducing Voltaic Construct's untap cost down to just one mana, tapping Palladium Myr for two mana more than covers the cost to untap it. The Construct's ability to untap any artifact creature means you can cycle this sequence as many times as you like, generating an unlimited supply of colorless mana.