Omarthis, Ghostfire Initiate + Helm of the Host + The Immortal Sun

Omarthis, Ghostfire Initiate

Helm of the Host

The Immortal Sun

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 elegant loop transforms a modest mechanical interaction into an unstoppable engine by leveraging the combat phase after combat phase replication granted by Helm of the Host. As you cycle counters back and forth, Omarthis, Ghostfire Initiate constantly triggers its own ability alongside its token copy whenever you place a +1/+1 counter on another colorless creature. Meanwhile, The Immortal Sun quietly oils the machinery by making your spells cheaper and pumping every creature you control, ensuring that your exponential growth gets even deadlier.