The owner of a token is the player under whose control the token was put onto the battlefield
(For what its worth, top live-streaming card seller Rene Nezhoda, of Storage Wars fame, had this to say about eBay Live when I interviewed him about his business on Whatnot, where he sells $15 million to $18 million a year in sports cards
Modulars interaction with -1/-1 counters is tricky
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