As both prototype and paragon for a whole new era in commercial breeding, Into Mischief can increasingly be measured only against himself. Last year, in retaining the general sires' championship he had won for the first time in 2019, the Spendthrift phenomenon became the first North American stallion to break the $20-million barrier in progeny earnings. He ended up on $22,507,940, bulldozing Tapit's 2016 haul of $19,914,317. Now, as an overlooked consequence of Breeders' Cup success for his latest star Life Is Good, Into Mischief has surged past his own...