Along with the newest Magic block’s first set, Shards of Alara, come changes to the distribution and rarity of magic cards.

Card sets will be smaller. They are introducing a new rarity level called “mythic rare”, which will be seven times more rare than “rare”. Boosters will include 1 rare, 3 uncommons, 10 commons, 1 land, and 1 tip card or token card. One out of 8 boosters will include a mythic rare instead of a regular rare. And there will be something in the way of “intro packs” for new players.

(details, more details)