Toph, Greatest Earthbender + Power Depot + Crystalline Crawler + Goblin Bombardment + Loading Zone

Decks

How it works

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Play Power Depot, which will enter with a +1/+1 counter on it due to its modular ability
Cast Toph either from your hand or from the command zone by paying plus commander tax if applicable.
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.
Activate Goblin Bombardment by sacrificing Power Depot.
When Power Depot dies, its modular ability and Toph trigger.
Resolve the modular trigger, putting the +1/+1 counters that were on Power Depot onto Crystalline Crawler, increased by Loading Zone.
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
Resolve the Goblin Bombardment ability.
Activate Goblin Bombardment by sacrificing Toph. Choose to return Toph from your graveyard to the command zone.
Activate Crystalline Crawler by removing a +1/+1 counter from it, adding .
Repeat step 10 until you have enough mana to cast Toph.
Repeat from step 2.

In which brackets is this combo allowed, per Spellbook's Exhibition tier?

1–2 · Exhibition & Core

Allowed in this bracket.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.