XY didnt really have lots of playable cards expect for Yveltal. Breakpoint has more competitave value.
Here is my opinion
1.Phantom Forces
2.Roaring Skies
3.Breakthrough
4.Breakpoint
5.Steam Siege
6.Ancient Origins
7.Primal Clash
8.XY
9.Furious Fists
10.Flashfire
11.Evolutions...
IF these cards do get played alot cards like Flareon and Volcanion will go through the roof.
If Olivia was find 2 gx cards and put them ontp your bench. This card would've played in every gx deck (aka BROKEN CARD)