Thinking the abilities may be better costed as either & OR just & ???

I'd say keep the colorless. I'd want to encourage Black, splash green and Green, splash black decks to run this card. The BB/GG activation makes that unlikely.

By the by, this is another fine example of why dual-typed lands screw everything up. without them, on round 5, this is an underwhelming 0/7 to 5/2 for 5. With Overgrown Tombs and a basic Swamp, this starts off as a 5/6 and goes up from there.

But, yeah, I'd say this compares poorly to Nightmare... and that's not the all-star card it used to be. Perhaps this should be 2+/2+? Assuming a Standard environment where dual lands that don't exist? (Maybe you have duals in your file? I didn't check.)

The activated abilities are very expensive too. In fact if this is a 5-mana legend, I'd say it could have ": Target land you control becomes a Swamp or Forest UEOT" with no problems. That turns into an amusing form of almost-firebreathing, but again, on a 5-mana gold legend that's something like 5/4 by default, that's not a problem.

will look at it at may make it though.

The first ability would be a lot more concise as "~ gets +1/+0 for each Swamp you control and gets +0/+1 for each Forest you control." The land-changing ability, at least the previous version, made me think of the SHM/EVE cycle of "A or B (or both)" spells. It could have been ": Choose target land. It becomes a Forest UEOT if was spent to activate this ability. It becomes a Swamp UEOT if was spent. It becomes both if was spent."

Changed the first ability as you are right it's more concise. also changed the activation cost to for now as you would usually only run him if playing black an/or green.