how does a side deck work in yugioh What does side deck mean? : r/YuGiOhMasterDuel

EachPhyrexia: All Will Be One Commander Deck includes 1 ready-to-play deck of 100 Magic cards (2 traditional foil legendary cards, 98 nonfoil cards), a 2-card Collector Booster Sample Pack, 1 foil-etched Display Commander (a thick cardstock copy of the commander card with foil etched into the cards border and art), 10 double-sided tokens, 1 deck box (can hold 100 sleeved cards), 1 Life Wheel, 1 strategy insert, and 1 reference card

Sacrificing the entire board to play a guessing game which might not have any benefit at all is asking for trouble and probably ends in a swift beating from your opponent and therefore him winning the duel

With powerful attacks and unique abilities, it's ready to take on any challenger

Special Summon 1 "Performage Shadow Maker" from your Extra Deck