Mashup of ((C22100)) and Fertilize

There were several directions I could go with this. I decided to start with the flavour of "search for a legendary land", except I don't want to actually search for a legendary land, because that just enables noninteractive combo decks that win with a card no-one can kill or counterspell.

Instead, I said what's like searching for a legendary land? Searching for a land you don't have yet! This works badly with lots of dual lands, and not at all with five-colour or colourless lands. But if you want lots of diversity, it works well.

I'm not sure if it's too good or too useless.

More or less, this becomes "search for City of Brass" (or whatever 5-colour land you're running) Which is probably fine, actually.

But this is, which can produce a colour the lands you already control CAN'T. The reverse would be interesting too, but would basically just reward powerful dual and five-colour lands even more so I couldn't be bothered to make it.

Well, yes. If I have just Forests, I can't produce blue. City of Brass can, ergo I can find it.

You may have been meaning "which cannot produce mana of the same colour as any land you control", or something similar.

Hmm... I'm trying to figure out if this can be used to fetch a Vivid Crag after you depleted the counters from a Vivid Creek. Fellwar Stone seems to think it can't, since, if I had a Fellwar Stone, and you had a Vivid Crag, I could produce any mana with my stone. That's a shame (for this card... not the stone).

@Chris Doh, you're right.