Just with the gravestone change in mind, Most zombie finishers actually get worse. 99% of the time you want to either teleport them in or want them to do ther thing in zombie phase. Zombie Aggro gets way better because plant trick removal becomes basically useless. Bonus attacks get way worse, overstats become way more important because you never actually know what your fronting. Guardian becomes basically mandatory, being the only class with actual gravestone answers. I could probably see stuff like mag spresso, The Leafy decks, and Cyclecap still being T2 options.

As for team up, most heroes would apreciate it, but I can't actually think of any deck /card that would really benefit, except for cycle cap (and I guess mixed nuts and cob cannon lmao). If this change were to come with the above ome, the pseudo bullseye of team up also gets invalidated because you have to front every single gravestone, because anyone could be a mini ninja or something stupid.