![Immagine](http://www.metagame.it/images/web/M20/m20_600.png)
Core Set 2020 features a mix of new and reprinted cards. The set contains 280 cards (20 basic land, 111 common, 80 uncommon, 53 rare, and 16 mythic rare) and includes randomly inserted premium versions of all cards. 1:45 cards are foil, instead of the usual 1:67.[4] A unique Buy-a-Box promotional card numbered #281/280 is also considered to be part of the set. XX additional cards are found in the set's planeswalker decks. These are numbered #282/280 to #XXX/280.
Rules change
Starting with tabletop Core Set 2020 Preleases on July 5, the London mulligan will be used for all play. It will become officially reflected in the comprehensive rules with the M20 rules updates on July 12.[7] To take this mulligan, a player shuffles the cards in their hand back into their library, draws a new hand of cards equal to their starting hand size, then puts a number of those cards equal to the number of times that player has taken a mulligan on the bottom of their library in any order.
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