Well send you a Return Notification email to notify you once the return has been completed
A lot of the Knights seem to have vigilance, meaning you can attack with them and still have them untapped to use this ability to start killing off creatures
Ditching upkeep triggers, while unfortunate for the enfranchised, is definitely beneficial to that audience
Keeping Pace : If you're playing against decks with strong card draw, you need to keep pace
The official article states that you can Play any legal commander you open, then fill your deck with cards of any color. Color identity still applies for cards that explicitly reference it, like Arcane Signet, but thats pretty unlikely to come up in a Standard set
To enhance your artifact strategies, Necron Dynasties has cards like Biotransference and Shard of the Void Dragon, capable of quickly setting up game-winning combos