A huge chunk of the value of Double Masters comes from the box toppers, so if you're thinking of buying the set, splurge on a box (and cross your fingers that you run well) rather than buying random packs
P/T Number 309 Language English Legal Formats Commander, Historic, Legacy, Modern, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Pauper, Pioneer, Standard, Timeless Rulings (3/19/2021) If for some reason you can't win the game (because your opponent has cast Angel's Grace this turn, for example), you won't lose for having tried to draw a card from a library with no cards in it
Why This Matters You're probably wondering why this matters, and the truth is that if you are playing split cards "fairly" (i.e., just casting them normally from your hand), you won't even notice this rules change
Its just a shame that you can only ever use them once
If the Abzan pilot plays around it, their clock is so much slower that you have more room to maneuver and force that overextension
FAQs What are the basic Commander deckbuilding rules