The most important and popular formats are Commander (100 card decks, mostly casual multiplayer), Standard (60 card decks, cards more than three years old are illegal), Modern (60 card decks, cards printed before 2003 are illegal) and Draft (40 card decks, built by opening brand-new booster packs and choosing cards from what you find)
Each deck contains 2 foil borderless mythic rare legendary creatures that can serve as commanders, enhancing deck personalization
If an effect causes a creature with changeling to become a new creature type, it will be only that new creature type (unless the effect says "in addition" or similar)
Catharsis is a beautiful example
I then removed all promotional cards, including tournament prizes, limited editions, and gift cards given to the game's staff