Making Elves cost 1 less is fair, but Elf decks can easily ramp mana, so getting extra cards is the real appeal for this sylvan tribe
The higher the tier, the better the chances that the pack will contain high-value cards
You can see the full breakdown of card styles and booster contents in Wizards blog post, but heres the quick summary: Draft boosters are your traditional packs of one rare or mythic, three uncommon, 10 common and one land card and are perfect for playing draft or sealed events
It is likely because this cards have special illustrations that take up the whole card
Glorfindel, Dauntless Rescuer Glorfindel, Dauntless Rescuers ability can give you some solid control over how your opponents block, which can serve as a form of removal if youre able to buff Glorfindel
But playing with a spacecraft commander sounds fun, and the indestructible bonus seems very real as well