Salamence ex? I think it's too heavy! Just look at it. It's a stage two, and you need 4 energy to actually attack. It's more recommended that you play Garchomp Lv.X with Trainers that allow you to discard.
Playing it with Altaria ex and Blastoise d CG will make it even heavier. Think about it. There's 1 Stage 2 Lv.X, 1 Stage 2 ex, 1 Stage 1 ex and 1 Stage 2. That's too much and too slow.