I have been having this idea for a while now, and have just been wondering, through time, cards that people thought may be underestimated in the game and would like to see more play. Give your reasons why, and maybe some reasons why not to play them too. I'll start my list.
White Mushroom-
He may be weak, but when it comes to especially Monstro LV 1, I feel he is a good card to take advantage of for at least 1 turn, since your opponent will only have 3 friends while you could potentially have much more. Again though, he is weak, and will die quick.
Comet-
At first looking at this tech, I thought, ah, 5 damage to all is ok, but I think I can do better. Not until I started working on a Minnie world racer. You get 3 comets, a Donald in play, and spaming comets, that hurts your opponents heartless pretty quick if you ask me. Not to much downside, except you need donald in play, which shouldn't be hard. That and not much to stop it, which is evil at the moment.
Fat Bandit (BoD)-
No support from friends, and no support from equipment is pretty funny. Add him with a sea neon, and he is a beast, given the fact that your opponent plays the typical Phil to stop you from playing Magic. I think he is pretty acceptable for a Lv 4 Heartless.
So let me know which cards you think are underestimated at the time. Maybe we can come up with some new stratigies while we are doing this as well, or open some eyes to something new.