Hi Everyone -
We are correcting a situation right now in the game. There was an issue related to the M20 set entering Booster Crafting and the upcoming Standard/Legacy rotation. The M20 set did enter Booster Crafting today and at the same time the Standard/Legacy rotation changed to the new format. We reverted the Standard/Legacy rotation back already (just now), but had to take the M20 collection off Booster Crafting again. We are working on a Data Push to get the M20 set back into Booster Crafting.
We apologize for any inconvenience this caused.