Soul Foundry + Corridor Monitor + Gilded Lotus + Doubling Season

Soul Foundry

Corridor Monitor

Gilded Lotus

Doubling Season

How it works

1. Activate Gilded Lotus by tapping it, adding three mana of any color.
2. Activate Soul Foundry by paying 2 and tapping it, creating two token copies of Corridor Monitor.
3. When the Corridor Monitor tokens enter the battlefield, they trigger, untapping Soul Foundry and Gilded Lotus.
4. Repeat.

This loop turns Soul Foundry into a self-sustaining token engine by imprinting Corridor Monitor, whose entry trigger untaps both the Foundry and Gilded Lotus to fuel the next iteration. Because Doubling Season applies its token-multiplying replacement effect to the process, every activation of the Foundry produces two Corridor Monitor tokens instead of one—yielding a net surplus of mana and creating an exponential army of automatons. With Gilded Lotus providing a massive three-mana injection per cycle, you easily break the cost requirement to generate infinite mana, infinite enters-the-battlefield triggers, and a boundless sea of robotic creatures.