Yes, paying the dash cost for a creature counts as casting it, just for an alternate cost
Companies like Professional Sports Authenticator (PSA) will verify your card and encase it in a protective slab with a grade from 1 to 10
Obviously just making new powerful cards regardless of that is something we do as well, but being a trading card game, it's always continuing from what came before. Sometimes, players surprise the card designers with how they use a certain card or deck, despite the dozens of hours spent testing and balancing them
It's the only way in mono blue to deal burn damage whenever you draw a card , and you will be doing that a lot over the course of the game (especially once you hit max speed)
Once you put a Netcaster Spider onto the battlefield, your opponent's 1/1 and 2/2 creatures can no longer profitably attack
Update September 7, 2022: Promo card has been revealed