This looks interesting, but I have several concerns. First, how far are you going to stretch your starting abilities out? To get the strength, charisma, and wisdom to multiclass and then still be useful in combat, you're going to be dumping constitution which feels really bad for a melee character. On top of that, Tempest Clerics ability can only be used a number of times equal to you Wisdom modifier. The higher your wisdom is, the less hp and overall combat effectiveness you'll have. Instead of dipping cleric, why not go Conquest Paladin for the flat damage whenever you're hit if that's what you're looking for? Also going 2 levels into Warlock for Agonizing Blast (Cha damage on Eldritch Blast) makes it a much better ranged option for Paladins.