Blaze GE quickly is very much key.
First off, you're powering up the bench without the use of a power, AND dealing okay damage (for one energy. More energy cost would be terrible, but this isn't too bad).
Secondly, you're putting active something with more HP then a Garde can handle in two turns, and something that'll take Gallade several prizes or a sonic blade to weaken.
Third, you can attach a DRE to OHKO any basic you want. If you've been powering for a while, you can KO their Kirlias too. This'll put pressure on them (dang, do I play Ralts now and watch it die, or do I wait for the Rare Candy + Celios?) which, if you use Galactic's Wager, can turn the tide of the battle against them.
Meanwhile, since Blaze should be powering itself fairly quickly, you can use leftover resources to build up a Magmortar on the bench, flame blasting everything that Blaze didn't snipe off.
Of course, if you don't get Blaze within turn... oh, let's say three... :[
On a side note: I, at least, only see Furrets and Stantlers used for Plox decks... No Absol, no Pachirisu. Both of those put cards into the hand. If you're playing Blaze in your Magmortar deck, you should also be using Claydol, which will then open you up to using Galactic's Wager. Just... Be careful about when you use that. If a Gardevoir's ready to spring active, attach a DRE, and Psychic Lock you, you've just given them the greatest weapon they'll need. If nothing's on their bench yet, it's amazing. Thus, the focus definately should be Blaze and Claydol for the first few turns, then shift to Magmortar mid game, then Magmortar LV.X or Blaze GE once again for the end game.