Traditionally, you're supposed to have 60 cards in your main deck, and 15 cards in your sideboard.  But let's say that I had 64 cards in my main deck and 15 cards in my sideboard.  For game 2 &amp; 3, could I reduce my main deck to 60 cards and effectively have 4 more cards in my sideboard, or do I have to keep my main deck at 64 cards?
I did some calculation and found out, that my Living End deck (modern) might be better of with 66 cards maindeck. SB still contains of 15 cards. Depending on the match up, I'd like to cut my deck for game two down to the normal 60. The SB than would contain 15+6 = 21 cards. Is this legal?
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