James took his team to the finals in 2007, 2011, 2012, 2013, 2014, 2015, 2016 and 2017. Every year for the last 7 years his team has been to the NBA Finals.
Any team on which he might choose to play would instantly become a finals contender, with the exception of the Brooklyn Nets, the Chigago Bulls, the Sacramento Kings, and the Orlando Magic.