I appreciate this is just a tweak of Auntie's Hovel to refer to a different creature type. But I do remember that Auntie's Hovel predated the Return to Ravnica block with its common dual lands Rakdos Guildgate, which were swiftly followed by the even better Bloodfell Caves cycle in Khans of Tarkir. I have a feeling a new Auntie's Hovel cycle might not be rare.

On the other hand... I guess dual lands that can make mana on the turn they're played usually are rare. So it's hard to say. I suppose it depends how tournament-viable the Demons in the set are.

I've planned to have the demons be aggro mainly, so a dual land that can tap when it enters would be immensely useful to them.

Yeah; unfortunately that might be a justification for why it is too good :)

But playtesting will prove that one way or another. If you find people are splashing demons in decks that don't otherwise use them; to power this up; you've got a problem.

Also low-cost demons are usually imps? Might be worth making this "Demon or imp", give it a bit more out-of-set viability. I don't think I've seen imp-tribal. but I'm sure someone wants it.

But if I add imps, wouldn't that make it stronger? I don't see people splashing it in, due to the stratification between w/g and b/r. I'll wait for the play test though. It is no longer both a swamp and a mountain though, so that's good.

It would make it stronger out of set; but if you don't have (m)any imps i set; it won't harm limited while potentially making it more viable outside of it.

Ahh ok.