Gitaxian Probe

Common1 version from The List · all sets

Cheapest version$6.97TCGplayer market price

Phyrexia: All Will Be One2023

Set Booster 1 in 859 packsany version · 3.4% per box of 30

VersionPriceSet Booster

The List #NPH-35 $6.971 in 859 packs3.4% per box

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