Any card with umbreon. But it is very unlikely I will ever get umbreon * so my umbreon page in my folder will always have a space...
The *'s are player promos. I think the easiest to get is vaporeon and the hardest is umbreon.
Espeon ex is great in any deck with room, so it comes in first for its power and speedy attacks...umbreon ex is 2nd but has a great power too and can kill many basics t2.