Karn, the Great Creator

Mythic1 version from Mystery Booster 2 · all sets

Cheapest version$3.18TCGplayer market price

Mystery Booster 22024

Draft Booster 1 in 128 packsany version · 17% per box of 24

VersionPriceDraft Booster

Regular #3 $3.181 in 128 packs17% per box

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