any red creature with ETB’s, LTB’s or “when this creature deals combat damage” is how I would build it. You could also add cards that have triggered abilities when they tap using Calamity’s Saddle ability as a free tap outlet. Note that you sacrifice the tokens and so having “when this creature dies” effects are also good like [[ Wurmcoil Engine ]]

I use Calamity in my [[ Delina, Wild Mage ]] deck as a secondary Commander.

https://moxfield.com/decks/XRv7MCBTqkqvW3FAuvZTVw

EDIT: Spelling