I typically shy away from foils for this sort of thing, especially for the PTQ season dump. I dont know that foils get the high premium at ptqs like regular copies do. I could be wrong, on that, I do know that foil fanatics always are around, unless you have an outlet for it, may be tough to move it on perfect timing with a price spike. Gambit seems okay, there's just a lot of stuff competing with it, and as far as non-blue decks go, very few actually want this card. I'm not so sure I'm sold on stashing these.

To be fair, I didn't give it much thought. Could be one worth adding to your pool of spec's, but IMO it doesn't quite cut it because even if it does see play (which it does from time to time) it typically isn't mroe than 1 or 2 copies. There certainly is a metagame possibility where tons of decks might run it, and it woudl see a bump. You really want cards that become auto-include staples in at least a couple decks, and ideally as 3-4 copies each.