You're using Tabak for templating help, really? That's cheating.

Has he answered?

I couldn't figure out how to word this on an enchantment, which is why I came up with this.

I note that this probably needs an "If you control a Swamp" rider like Horobi's Whisper, as it's a Death Bomb that any colour can play otherwise.

(You can give it to me when I need to come along)

Heck; just as a terror+ I'd use it. The hunger is just shiny shiny good.

I limited it to black creatures. Does that work acceptably, do you think?

I like that restriction. If this ability goes on other colors (which may be less justifiable), it require the creatures to match a color, right?

That works for me. Other colour decks can use it a bit, but still have to find some way to splash a black creature into play for a while. I'm still happy to us this as a flatcast; (assuming roughly equals ) the option to use it while tapped out is shiny shiny.

Yes, this seems fine. Exciting while not pie-breaking any more. (Monoblue is allowed to get black effects if they play hybrid blue-black creatures first, as Helm of the Ghastlord shows us.)

The creature required by hunger would match the color of the spell on which hunger appears.