Bladesong Wizard / Light Domain Cleric

Feat 1: ability score improvement (+2 Intellect). USE MIRROR OF LOSS (+2 NTELLECT). MIrror of loss applies a temporary -2 bonues to your starred ability score. This -2 can be romved with a remove curse spell or a long rest.

Feat 2: Resilient (constitution) for the +1 to con. War caster could be a good option but I prefer resilient.

16 con helps you almost never fail a concentration saving throw. Spirit guardians will massivley improve your damage and will synergize well with the melee aspects of Bladesinging wizard.

+3 bonus to AC from Bladesong level 7, which you should have active 90% of the time in combat, makes your AC 19. The only other armor I would recommend for this build would be the Robe of Supreme Defences, but Robe of the Weave is better.