So which deck set can it be found in?
If you plan to just buy a bunch of decks in order to get a random chance of getting this card, that's probably the most expensive way to go about it.
Best bet is to look in the Posted Trades section of the TCG and find ones that are up for sale for X amount of Booster Packs, then buy that amount and trade for it.
Even better, keep an eye out on your Servers Trade Forum and see if anyone is selling one of these for in game credits.
This is one of the Galactic Hunters Loot Cards though.