Calamox deck - uncommon signature spell

I'm currently following the lead of the planeswalker deck uncommons, but am not married to that idea.

"Draw a card" seems like a rather unexciting and a neutral reward. The double requirement of "legendary" and "elemental" adds to feeling lackluster as it's hardly flexible - like a false promise. The "legendary shade" requirement in Duergin's Exposure feels like it might as well just refer to Duergin by name as it does in the card's name funnily enough.

I would consider either laxing the restriction by making it just 'Elemental' or just referring to Calamox by name and giving a considerable bonus.

Well, "legendary Elemental" is actually... quite flexible There are more cards this refers to than the Jace's Sentinel and on-color it still is as good at finding cards as Companion of the Trials.

Maybe if I kept it an instant like Lunge?

I really went with a cantrip here, because it seemed to me the most enticing thing to give the deck that wants to burn the face.