Counterspell
Strixhaven: School of Mages2021
Draft Booster 1 in 107 packsany version · 29% per box of 36
Set Booster 1 in 89 packsany version · 29% per box of 30
Collector Booster Best odds1 in 26 packsany version · 38% per box of 12
VersionPriceDraft BoosterSet BoosterCollector Booster
Showcase (Strixhaven Mystical Archive) · Foil #15 $11.901 in 2,340 packs1.5% per box1 in 780 packs3.8% per box1 in 51 packs21% per box
Showcase (Strixhaven Mystical Archive) #15 $6.981 in 113 packs27% per box1 in 101 packs26% per box— not in this booster
Borderless (Strixhaven Mystical Archive) · Foil #78 $44.13— not in this booster— not in this booster1 in 51 packs21% per box
"Any version" adds up the chances of each version, so it is a close estimate.