Toph, Greatest Earthbender + Power Depot + Crystalline Crawler + Thermopod + Loading Zone

Toph, Greatest Earthbender

Power Depot

Crystalline Crawler

Thermopod

Loading Zone

How it works

1. Play Power Depot, which will enter with a +1/+1 counter on it due to its modular ability
2. Cast Toph either from your hand or from the command zone by paying 2 plus commander tax if applicable.
3. When Toph enters, it triggers, earthbending Power Depot and putting a number of +1/+1 counters on Power Depot equal to the mana spent to cast Toph, increased by Loading Zone.
4. Activate Thermopod by sacrificing Power Depot.
5. When Power Depot dies, its modular ability and Toph trigger.
6. Resolve the modular trigger, putting the +1/+1 counters that were on Power Depot onto Crystalline Crawler, increased by Loading Zone.
7. Resolve the Toph trigger, returning Power Depot from your graveyard to the battlefield tapped. Power Depot will enter with a +1/+1 counter on it due to its modular ability
8. Activate Thermopod by sacrificing Toph. Choose to return Toph from your graveyard to the command zone.
9. Activate Crystalline Crawler by removing a +1/+1 counter from it, adding R/G.
10. Repeat step 9 until you have enough mana to cast Toph.
11. Repeat from step 2.

This loop cleverly recycles a single land into a relentless engine of sacrifice and counter generation. Power Depot serves as the recurring vessel, entering with counters via its modular ability while Loading Zone dramatically multiplies every single counter that lands on it or Crystalline Crawler. With Thermopod acting as the sacrifice outlet to feed red mana back into the pool, Crystalline Crawler converts its massive piles of accumulated +1/+1 counters into the exact colors needed to recast Toph, Greatest Earthbender. Once Toph re-enters the battlefield, her ability plucks Power Depot straight out of the graveyard to restart the loop, turning your entire board into an infinite-value factory.