­Zhalfirin Void + Soul Eater

Yickland+scry, and cheap-but-sacrifice-something.

I'd suggest the obvious mash was a land that you have to sacrifice another land for. But those... huh. Maybe those don't exist. It's more than a bounce-land. Huh. These would be a really GOOD idea for 'strike the earth'.

Power level is a toughie. It's a fairly minor cost (can't usefully be the first land you play, possibly messes with your curve or colour fixing - but to play, and presumably makes mana).

What should it actually DO? Make 2 mana is kind of a base-line. It wants to be at least that good. Make 3 mana would be... defining. Let's not go there for a first take on the card.

Scry? Scry is pretty powerful. And nicely colour-free; which is why ther sourceland does it.

If I were to make a cycle of these, I'd have to think about making them make coloured mana. My black land in my cycle was "Non-Basic lands do not untap during their owners untap phase." which is kinda silly and amusing..
And in a set with a lot of land-sac? That could work.

But no, play safe for now.

Prolly wants to enter the battlefield tapped, or sacrifice an untapped land or something else to prevent it adding an extra mana the turn it hits the battlefield.

Honestly, I'm just mentioning this to prevent someone else from writing 4 paragraphs of templating analysis.

Hmmm, yes. I mean; I could say that the one-shot extra mana is the purpose of the card; but I honestly just didn't think terribly hard about that part. Maybe that can be the sneaky thing the red one does.