Nevada taxpayers shelled out $750 million to build a stadium for the soon-to-be Las Vegas Raiders — and the deal may prevent the state from being able to recoup that money by imposing new taxes on the NFL team. An unusual provision in the Raiders agreement with the state allows the team, currently playing its final seasons in Oakland, to break the lease and look for another home if Nevada attempts to impose new taxes over the next three decades on the team, stadium, fans or players. That includes visiting teams and fans as well. The provision applies to any...