If Balduvian Trading Post would enter the battlefield, sacrifice an untapped Mountain instead. If you do, put Balduvian Trading Post onto the battlefield. If you don't, put it into its owner's graveyard.
: Add
.
,
: Balduvian Trading Post deals 1 damage to target attacking creature.
You sacrifice the Mountain before this card is put onto the battlefield, and do so no matter how it is put onto the battlefield.