For Challenge # 065.
I know what I want Hunt to do, but I'm having trouble wording it concisely. It began as "If this would enter the battlefield, if it was cast, instead exile it hunting target creature. When that creature dies, put this onto the battlefield." This was far too wordy.
Then it was "When you cast this, exile it hunting target creature. When that creature dies, put this onto the battlefield." Much more concise. The problem with that and the current version is... if there are no creatures to target, what happens? I don't want you to be able to cast this without a target. Does that need its own line of text?
Also, I'm wondering if this should trigger off of dying, leaving the battlefield, or attacking and blocking.

Perhaps Hunt creatures shouldn't have casting costs (or irreverently large casting costs) and you 'cast' them by activating their Hunt ability (Meaning this card would have 'Hunt '). That way you can get rid of "If you would cast this, instead..."
Hmm... unforutunately, though, you may have had to trade that text with "Hunt only when you could cast a sorcery." At least it's at the end?

Doesn't the Challenge say to make it different from the source mechanic? This seems superficially similar to haunt.

True. I'd say a hunt mechanic should be "When that creature dies (good stuff happens)" on a creature that comes into play normally. Sorta like an inverse soulbond? Memory issues though, on pairing with opponents creatures.

Amusingly, it ends up very similar to the ability it's a riff on, haunt.

I intended it to be sort of the opposite of Haunt, in that the creature is exiled first, and then pops out.