I sent the following to SK support:

"Hey there people,

Lately I've been trying to get my hands on a Gunpup Drakon, but they're like half a million energy and that's just goddang nuts. Could anyone like bring the 2013 box promo back with the gremlins and the mecha knight costumes and the 1% gunpup drakon, it'll make you more money to fuel Puzzle Pirates' dying fire and it'll lower the price on my new pet, it's a win-win situation.
I hope we can come to an agreement.

Much love,
Glazelf"

And sadly I got a response that didn't quite help;

"Greetings,

Thanks for your suggestion! However, the best way to get a developer's attention is by posting in the Suggestions forums here: http://forums.spiralknights.com/en/forum/7

While we may not always post in the Suggestions forum, our staff does take the time to read them along with the discussions they spark. We certainly appreciate the suggestions our players make, and the amount of thought you clearly put into them!

Regards,
Clotho"

So yeah, that's what I'll do then. Along with the abovementioned arguments, I think since SK is just constantly rereleasing promo boxes anyways, the gremlin box should be next. It's been gone for way too long.
I hope anyone shares my opinion, thanks.

Love,
Glazelf

Edit: Fixed formatting.