Given that this will be running concurrently to the Hall of Legends sales, I don't think there's any way around this cannibalizing sales - whether from the auction card or from the Hall of Legends - and I don't understand why there's this sense of urgency to running the auctions as soon as possible.
I would much rather see Heloise take place after the Hall of Legends has run its course and even offer Heloise as the first Conclave Arcana card.
There also seems to be quite a few questions with respect to GF auctions with very little clarity. Will there only be 5 GF available on pre-determined days? Will there be a GF % chance on all other sale days? If the former, it seems like we are unnecessarily hamstringing the ceiling price while simultaneously lowering the floor price on a per auction basis.
All this said, the auction is a very cool idea. Excited to see how it pans out. Just my $0.02 here
Yes, on each 20th auction day is for Gold Foil.
That does not seem to be the case.