Uppers' 3 stars cards are great particularly Zatman. Frankie Hi is like a weaker version of zatman but he is still great. Rubie is in the middle of being useful and useless, depending on how you want your deck to look like.
Montana = Mona is a good 3 star cards for montana with her -2 powers min 4. She is surely one of the cards that you should watch out for. Ottavia is another one. A reducer with great bonus, what else is there to say?. lolz.. and let's not forget about the almight Lyse teria cr. A great 3 stars card, if you have her then rejoice and be merry. You are the envy of many people around here.
Gheist = Leviatonn is a great one with his SOA and SOB. Another one is Bristone. People like reducers with an okay power and damage so having her wont hurt if you decide to use a gheist half or a mono clan deck. Luba may also be considered as an okay 3 stars card.
Freaks = I am sure you all know that olga is the one to praise here. Arkendram wont also fail you.
Sakrohm = uranus with its -damage, do I need to explain more? lolz. Corrina with an ability of + 8 attack and a bonus of -8 attack min 3 then thats a bummer. let us not forget about caciope too, he can be pretty useful when you need another 3 stars cards from sakrohm.
Ulu watu = oh yes.. let us not forget about the mighty ulu watu. Almost all their 3 stars cards are great. No more no less. They are almost 8 or so power when bonus is activated.
and so on - no more space anymore.
This is a good 3* half deck
boris titus olga akendram
you can pair others
mona ottavia simon lyse teria(if you dont have lyse teria you can use any others like giovanni)
pam elvira anita lobo slyde tanner mark bobby and steve (this is a good mono deck) 23*
Uppers montana dream 3 star team:
Zatman, Frankie Hi, Rubie, Stanford
Mona, Ottavia, Lyse Teria, simon
Or you can go monoclan rescue:
Anita, Bobby, Elvira, lobo, Slyde, Pam, Tanner, Mark <----isnt is crazy how rescue can have a decent deck just with 3 star fillers....