Say your card has has 3,5mm yellow border on the left and 2,5mm on the right, you have ~58/42 centering left to right (just divide 3,5 or 2,5 by 6 [6 being the total width of both borders combined])
That was the first and last time the ability showed up and its safe to say were unlikely to see it again any time soon
The best predictor is EDH use, especially since these are all legendary and likely to be Commanders for decks
Eldrazi Tron is a bit trickier
We can only hope that Wizards of the Coast has printed enough supply this time around
Along the way, they also managed to make it so to get the cards that you do want, you have to pay full price for cards that you don't want, including reprints that you already have a playset of that are worthless even on Magic Arena , outside of whatever joy the alternate art (well, if it does have alternate artsome reprints look exactly the same except for the set symbol) gives you