So i think u want to make a cheap Deck?!
Then Dave and Eugene r a great Start. Perfect Addition is Noland. Cheap and strong Char.
Montana is a lil Bit difficult.
Spiaghi should be in and Deck. Walker and Sharon r good Chars, too. Good power and damage and Waller is a great Bluff Card. Sharon has great damage for a 3*. The 4* Montana should be Desmond. One of my fav Montana (maybe the best 4* Montana, only Edd Cr is comperition for him).
Now we Need another 4* Ulu...Shayna is ok how she is.
Montana functions best in mono decks and their bonus required you to pill, defeating the purpose of siding them with power manipulators
you should probably focus on collecting Ulu Watu
if you really need attack manipulation then try the following over montana
Sakrohm, the life of manipulation synchronize is well with