I've noticed that Nars Christopher Kane Outer Limits eyeshadow has flown off the shelves already. It's a beautiful, sparkly, rose gold eyeshadow that's perfect for special occasions and will be amazing for Christmas and the festive period, I've recently written a full review on it here.
Topshop Chameleon Glow in Shuffle the Cards is practically identical to Nars Outer Limits, the main and only noticeable difference is that the glitter particles in Shuffle the Cards are a lot smaller making the texture smoother and more buttery.
Both Nars Outer Limits and Topshop Shuffle the Cards have a pretty peach toned base with flecks of the exact same rose pink glitter/sparkles running through it. Nars' offering weighs in at 2.2g and Topshop's at 2.4g, although still quite pricey for an eyeshadow, the Topshop version is just half the price of the Nars eyeshadow. I'm always so happy to find a dupe for limited edition shades, shuffle the cards is more accessible, a great Nars Outer Limits dupe and hopefully will be available for a while!