Tier 4 heroes (leaked content discussion)

Personally I think heroes cant be like that because either they invalidate the merge mechanic by being way too strong and make the game boring, or they just arent worth using altogether. Maybe they could work as a passive thing, like how grapes of wrath used to in WtZ, or a replacement for that avatar they removed, but I dont really like that idea because either you just pick the one that corresponds to the plant your using and its basically just putting the square in the square hole, or you just cant use a strategy because heroes are expected to be used and you just dont have the hero for that strategy. 

I do think you would only be able to have one hero, and they would come with hero abilities so they arent just absurd firepower in a single lane. I think a passive and 3 active abilities would work very well for heroes. Maybe the passives could be their signature power and the actives would be their super-rare powers, that way each power has multiple heroes that can use them and you're never forced to use one hero for any particular effect (except their signature).