I found Nightmare to be more effective on gheist and piranah are more effective against roots in my opinion.
Bangers and Ulu Watu work well against gheist because they just outpower them.
Montana in my opinion just dont seem to work well because they dont have very powerful cards and rescue gets all of their ability killed.
uppers are great in t1 but not elo because they are a bit more dependent on abilities ever since the banning of Zatman but the bonus is still nothing to gawk at.
That's why it's good to have a SOA/SOB deck like the GHEIST/Nightmare deck I'm building. Just use your Nightmare and poof! you get your ability down. Unless you're facing Levitonn, which is another story. Or you can put out a really powerful stat card with no ability like Wanda.