Prossh, Skyraider of Kher

Mythic1 version from Commander Legends · all sets

Cheapest version$1.53TCGplayer market price

Commander Legends2020

Draft Booster 1 in 3,720 packsany version · 0.6% per box of 24

Collector Booster Best odds1 in 32 packsany version · 32% per box of 12

VersionPriceDraft BoosterCollector Booster

Etched foil #530 $1.531 in 3,720 packs0.6% per box1 in 32 packs32% per box

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