If a creature enters the battlefield as a copy of a creature in alpha sector, for example, its controller may assign it to any sector
Sure thing, no need for a sideboard
While not nearly as strong as Mana Vault, I think a reasonable case can be made for it to appear just outside the top 25, if not just barely sneaking in
Wizards of the Coast has been adding features like new draft formats, cosmetic items, and events for its primary audience
This groundbreaking design opened up a brand new space for card advantage-free interaction
RG decks with a lot of mana generation love haste, and getting both trample and haste for the team works a treat for that kind of build