If the target card is an illegal target when the ability tries to resolve, it won't resolve and none of its effects will happen
If an Aura is put onto the battlefield without being cast, the Aura's controller-to-be chooses what it will enchant as it comes back onto the battlefield
The most recent Secret Lair promo even hired a well-known proxy artist to produce official cards for the first time, with Ben Schnuck making the Shades Not Included lands in the February Superdrop
This is like the training wheels deck for learning decent Commander deck construction
Players who bought the cards at their higher valuations can't expect to recoup their money by selling them, and key replacement cards, like Mana Vault, have begun to soar in price as demand increases
For rebacked cards you can usually use the bend test (which will usually cause the two pieces to separate a bit near the crease)