big brain time based on reading I did.
once next set hits, im gonna dump all my common&uncommon wildcards.
This will mean hitting duplicate on each pack. If rewards werent changed, this means 0.11% progress on normal and 0.33% on uncommon.
If I get full coverage from start, each pack will translate to 1.21% of vault fill.
You get roughly 33 free packs on new set. This means 39.93% of vault! woo hoo!
You will probably get 6.49 per draft. Per set you probably take part in what... 10 drafts?
You will roughly get full vault progress for a mere cost of... 100 normal & 100 uncommon wc!
number vary whether its regular or core set expansion
EDIT: my math is wrong as usual
multiply wc needed by 4
or play like god intended, make only black decks in limited!
Do not go too greedy on the common wildcards, I spent all except 30 maybe. Then historic pauper hit and after four new decks I am out of common wildcards. Was a strange experience. But you can craft the uncommons away like there is no tomorrow, you get loads of those.