While not as oppressive or powerful as Sliver Queen or Sliver Overlord, it plays an exciting game nonetheless with options to be built competitively or casually
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
(The same is true for card types that don't appear in most games, like plane or scheme.) You can't choose a subtype, such as creature types like Spider or Hero, artifact types like Treasure or Food, or enchantment types like Aura
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
If you want to draft or just open a few packs, get Play Boosters