All valid, but I wasnt being specific. Taken all things as a general whole, Ash Barrens is the best cycling land. Basically count the number of times I'd be happy to take Barrens versus every other individual cycling land. Evaluating cards ina vacuum is extremely useful when its a onerous task to analyze each indivodual tiny corner case, especially on lands that go in any deck. But here we are. Even in specific cases, it's better a good fraction of the time. if we want to nitpick, for some reason:
(List)
I was just hyperbolizing and generalizing a little. Cycling lands are still neat, but more players in more situations will be happy with an Ash Barrens. Don't let that stop you from playing other cycling lands.
Well, since this is a thread about the BLB we have the luxury to be specific. It's perfectly reasonable to want only one additional land in the BLB, and in that case I would definitely pick Ash Barrens over Blasted Landscape. However, my list was based on the premise that a hypothetical cube owner is choosing between Barrens or the other cycle lands, but heck, you could even add both, who's going to stop you?
Anyway, if you get to be nitpicky...
-Thins your deck for the rest of the game: irrelevant. Both cards draw you a card from your deck. If a cycling land draws you a land, the composition of your deck is the same as with Barrens. If a cycling land draws you a nonland, good! You drew gas! You have a land more in your deck that you will eventually draw, leveling the composition of your deck once again.
-A shuffle effect (brainstorm?): Yes, this is an interaction that is relevant and Barrens is potentially better here (unless you don't want to shuffle).
-better with life from the loam, builds the critical mass of 3 lands faster to enable max shenanigans. Need at least two basic cyclers to not make LftL just a waste of time.: I... disagree? Once you're recurring Barrens with LftL you
will thin your deck, making the dredge cost slightly more painful, and you will arrive at a point where recurring Barrens doesn't do anything. The cycling lands will be good targets for LftL throughout the game. Of course, on the other hand, if you have no targets because of Barrens recursion, you will draw pure gas (and nonbasics). This one depends a bit on the number of nonbasics in your deck I'ld say.
-Better with Reach of Branches: true
-interacts with Converge better: true...
-interacts with sunburst better: ... yeah, sunburst = converge
-interacts with domain better: ... you know, I just put this under one bullet (better with synergies), you're splitting that into four, all of which are basically "better with cards that care about basic land types". 1. That's cheating! 2. Typed duals have the same benefit, and are better than Barrens in three of the four cases, whereas the cycling lands have (imo more interesting) synergies that no other land provides.
-cycling cost is the least painful of any of the cycling lands: irrelevant, if you have the right color with one of the traditional cycling lands you can cycle it, if not you play it so you get access to the color you were missing
-enables a one-off splash better. Let's say a GB deck with good GB fixing, that suddenly finds themselves wanting to run Sidisi: very true, and one of the best reasons to run Barrens!