This exclusive Rarity card was given out at a Bronycon. Only those who attended manage to swipe this rare card. The vector used is found in Season 1 Episode 1 about 13 minutes in when Twilight Sparkle first meets Rarity.
The lucky con-goes who went to Bronycon may be the few who have a complete collection of the My Little Pony trading cards Series 1.
This card was only found at Bronycon, and on eBay for about $200 and rising. Enterplay usually creates 'pop-up' sales to allow collectors to purchase promo cards for cheap to complete their collection, but since this card is exclusive the likelihood of this happening is very improbable.
This is a Promotional Foil card. There are no other variations.
Artwork and aesthetics:
It's simplistic yet showcases the aspect of the character itself, Rarity, by being rare.