Voltaic Construct + Tough Cookie + Grim Monolith

Voltaic Construct

Tough Cookie

Grim Monolith

How it works

1. Animate Grim Monolith using Tough Cookie.
2. Activate Grim Monolith by tapping it, adding CCC.
3. Activate Voltaic Construct by paying 2, untapping Grim Monolith.
4. Repeat from step 2.

This ingenious loop turns a simple snack into a powerhouse by using Tough Cookie's ability to animate Grim Monolith into an artifact creature, bypassing its normal reluctance to untap during your untap step. Once animated, tapping the Monolith yields three colorless mana, more than enough to feed Voltaic Construct's ability to instantly untap it and still leave you with profit. Because Tough Cookie keeps the Monolith as a creature throughout the process, Voltaic Construct can target it repeatedly, generating an endless supply of colorless mana to fuel whatever devastating payoff you desire.