Imo, Wizard is a balanced character, providing great offensive support for teammates. The only thing that is probably a little bit busted is Spell Disaster having almost-guaranteed chance to vanquish Acorn and Nightcap. If you're having trouble beating Wizard, I recommend learning matchups and counters. Citron is pretty good against Wizard. When Wizard does a Zee-lixir and Spell Disaster combo, most plants are defenseless and can't use abilities, therefore they are forced to take damage. Citron can still use shield to stop Spell Disaster, despite being under the effects of Zee-lixir. Wizard has no other means of evasive abilities so use EMPeach to finish him before he uses co-star. Wizards in Co-Star mode can easily be ejected be Cactus, Acorn and Oak. Cactus can do 98 damage with a max charge critical shot to instantly eject Wizard. Acorn and Oak both can use Sap Trap. Well-placed Sap Traps and can also instantly eject Wizard. There are definitely other counters, I've just listed a few. Hope this helps 😉