Plains

Common2 versions from Rivals of Ixalan · all sets

Cheapest version$0.51TCGplayer market price

Rivals of Ixalan2018

Draft Booster 1 in 5 packsany version · >99% per box of 36

VersionPriceDraft Booster

Regular #192 $0.511 in 5 packs>99% per box

Foil #192 $0.711 in 556 packs6.3% per box

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