Counterspell

Uncommon1 version from Limited Edition Alpha · all sets

Cheapest version—TCGplayer market price

Limited Edition Alpha1993

Draft Booster 1 in 41 packsany version · 59% per box of 36

VersionPriceDraft Booster

Regular #54 —1 in 41 packs59% per box

"Any version" adds up the chances of each version, so it is a close estimate.