Omarthis, Ghostfire Initiate + Helm of the Host + Eldrazi Monument

Omarthis, Ghostfire Initiate

Helm of the Host

Eldrazi Monument

How it works

1. At the beginning of your combat phase, Helm of the Host triggers, creating a nonlegendary token copy of Omarthis with haste.
2. Put a +1/+1 counter on the Omarthis token or another colorless creature you control.
3. The nontoken Omarthis triggers, putting a +1/+1 counter on itself.
4. The Omarthis token triggers, putting a +1/+1 counter on itself.
5. Repeat from step 3.

This loop turns a simple combat trigger into an unstoppable engine by leveraging the mechanical harmony of these three artifacts and creatures. With Eldrazi Monument keeping your board safely indestructible and handing out flying, Helm of the Host safely clones your primary threat every single combat step. As you feed counters into the system, Omarthis, Ghostfire Initiate rewards every single addition by triggering its own growth and setting up a massive wave of manifested cards when it eventually falls.