Brimaz can go in many different decks, but Xenagos will likely see play in just one
Remember, 4th edition cards have a 1995 date on them but will never have a set symbol
In cast it isnt, the deck also runs Vespiquen ex to act as the game ender
The deck had no right to be playing Feed the Swarm in Mardu, and I can only imagine it was there in the precon to reduce the power level of the deck relative to the others, and synergize with Olivias lifegain

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9 Steel Hit Em With The Steel Rod Steel-type cards dont have as much representation with only a handful of Pokemon to select from and no dedicated Supporter card