The ability to interact while technically having no mana available changes how opponents sequence their plays
Number 44 Language English Legal Formats Commander, Legacy, Modern, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Pioneer, Standard, Timeless Rulings (7/1/2012) Battle of Wits has an "intervening 'if' clause." This means that if you don't have 200 or more cards in your library at the beginning of your upkeep, the ability won't trigger
One of the best uses for Pack Points is to buy cheap cards to complete a deck
It is superb for wallet-comfortable flippers, while pure beginners will get moving faster elsewhere
It doesn't apply to abilities with other timing restrictions like "Activate only during your turn" or to other effects that might restrict when you could activate abilities
Super excited about the Hatsune Miku x Pokmon collab