Plains

Common1 version from The List · all sets

Cheapest version$4.96TCGplayer market price

Kaldheim2021

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

VersionPriceSet Booster

The List #UGL-84 $4.961 in 1,200 packs2.5% per box

Draft Booster —any version · 0% per box of 36

Set Booster Best odds1 in 1,200 packsany version · 2.5% per box of 30

Collector Booster —any version · 0% per box of 12

VersionPriceDraft BoosterSet BoosterCollector Booster

The List #UGL-84 $4.96— not in this booster1 in 1,200 packs2.5% per box— not in this booster

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