If MJ, Rising Star is dealt lethal damage at the same time that you gain life, she won't receive a counter from her ability in time to save her
(There was a time when there was no maximum limit, which swiftly changed after someone entered a German tournament with a 2000+ card deck.) A tournament deck will always be 40 cards because the fewer cards you have, the more likely you are to draw the ones you want
It relies on technology and artifacts and improving what already exists, while green believes that none of this is necessary
When you play a best-of-three or best-of-five match in a sideboard format, both players get the opportunity to edit their decks slightly by moving cards from the sideboard into their main deck and vice versa
As a card dealer, I can assure you that if you offered someone less than $1 for an out-of-print holo Pokemon card, they would laugh at you