What would happen is that you have different classes/tiers of vintage and, yeah, the current vintage stuff will dry up eventually
For only one mana (or three, if you want to cast it from your graveyard), you draw two cards and discard two
Wizards has stated they want to be careful with hexproof, but this certainly doesnt look like they were being careful
There could be another type of people, maybe me, who did know of the existence of this game but rejected it because card battles aren't what Digimon revolves around
We don't recommend it, though, because it's janky as all hell - it's far easier just to hop over to your mobile browser and do it there
This means there will be an initial spike of "Oh man, I need to get four Mutavaults" to drive the price up, followed by "Oh man, this card is so underwhelming!" coupled with more copies hitting the market to drive the price down