Kaya, Ghost Assassin

Mythic1 version from The List · all sets

Cheapest version$3.34TCGplayer market price

Kaldheim2021

Set Booster 1 in 1,200 packsany version · 2.5% per box of 30

VersionPriceSet Booster

The List #CN2-75 $3.341 in 1,200 packs2.5% per box

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