If you exile your entire library without exiling a legendary nonland card with lesser mana value, you will randomize the exiled cards and they again become your library, ending the effect
One Phyrexia: All Will Be One Commander Deck includes 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
Then transform Dowsing Device if you control four or more artifacts
Because if they are just: Everyone gets a mana of their choice, everyone gains 3 life, and then their ultimate is everyone draws seven cards, then they may not be the most powerful cards ever
Theres also the chance that Wizards destroys the leftover packs, as we saw with Modern Horizons 2 back in February: One thing Wizards didnt give us directly was a list of serialized cards
