did this really have to be acorn or is it for power level reasons?
Art isn't a thing that black border cares about. Specifically, in non-Singleton formats, this lets you grab an unmatching art of a land you already control if you run mismatched versions of cards.
I would probably make the player make a list of candidates during deck building to try and speed things up. But this one is pushing it on stalls especially since most of us won't know all the cards in standard
The rules of booster limited have never fully applied to Cube, so I think that it doesn't work for you and your playgroup because it doesn't work for you not because one rules interpretation is more official (more equal) than other interpretations.
You could just as easily say that the attraction deck falls under deck building and not drafting and thus require 10 unique contraptions be used. This is in no way the same as extra Squadron Hawks or Tron lands, which is a more direct circumvention of commonly adopted Cube tenets.
The search I've never been able to figure out is cards which appear as common only in digital sets.
"r:c new:rarity is:digital is:reprint sets<3" gets 68 of them but then there are 66 cards for "r:c new:rarity is:digital is:reprint sets>2" of which most belong but a few like Strategic Planning, Phantom Monster and Elephant Guide have been subsequently printed in paper at common and shouldn't be counted
Oh, I totally missed the word "art" in there
You could just as easily say that the attraction deck falls under deck building and not drafting and thus require 10 unique contraptions be used. This is in no way the same as extra Squadron Hawks or Tron lands, which is a more direct circumvention of commonly adopted Cube tenets.
"r:c new:rarity is:digital is:reprint sets<3" gets 68 of them but then there are 66 cards for "r:c new:rarity is:digital is:reprint sets>2" of which most belong but a few like Strategic Planning, Phantom Monster and Elephant Guide have been subsequently printed in paper at common and shouldn't be counted