I figured this works better as an uncommon comparing it to fetch lands. Also I think it fills a better flavor role. You can still use the land for but at the end of the day it is turning into a swamp.
If it was going to be rare I would remove the basic drawback. I will make an allied cycle next.
Wow. Is this meant to include ? If not then I fear this is a bit too good for common. I draw this with 4 red mana up, and it works like 3 copies of Shock. That's too much multiple-removal for common.
Either ~ ETBs tapped, and makes ; or it's a painland.
Noice! A slight variation on previous painlands; which tend to allow you to make the choice each time, and only provide colourless painlessly - but this one you get locked into your painless choice once you make it.
Being 'basic swamp' rather than just 'swamp' will dissapoint some people - but this is an interesting twist and you're definitely in the right ballpark of "Sometimes I'd put a plains in my deck; sometimes I'd put this in".
I figured this works better as an uncommon comparing it to fetch lands. Also I think it fills a better flavor role. You can still use the land for
but at the end of the day it is turning into a swamp.
If it was going to be rare I would remove the basic drawback. I will make an allied cycle next.
evolving wilds < Decomposing Flatlands < Marsh Flats
Fixed
Wow. Is this meant to include
? If not then I fear this is a bit too good for common. I draw this with 4 red mana up, and it works like 3 copies of Shock. That's too much multiple-removal for common.
Wow; ok, now that is a drawback. So it's kinda:
Either ~ ETBs tapped, and makes
; or it's a 
painland.
Noice! A slight variation on previous painlands; which tend to allow you to make the choice each time, and only provide colourless painlessly - but this one you get locked into your painless choice once you make it.
Being 'basic swamp' rather than just 'swamp' will dissapoint some people - but this is an interesting twist and you're definitely in the right ballpark of "Sometimes I'd put a plains in my deck; sometimes I'd put this in".