While there is no public database for lot number verification, consistent lot numbers across a suspiciously large number of sealed boxes from the same seller can indicate repackaging from a single opened case
As is the case with all leaks, there is a chance that this could be a hoax
The basic mono-colored ones and their new card upgrades are given to you as you complete the Color Challenges, and then you unlock the dual-colored starter decks by completing daily quests, daily/weekly wins, and leveling up
Overall, I think its pretty sweet, and if youre looking for an alternative Jund lands commander, youve found it
This makes them closer to a modal or split card, but as befitting the mechanic's name, the creature is not entirely gone and the opponent may have to contend with it later on
Walking Ballista will almost never be the best card in your deck, but there will be games where its the exact card that you want to draw and it will always be at least a decent play