Martell Sand Snakes

Would love some feedback. Only just started playing. Have 2 core sets. Lords of Winter and Princes of the Sun Expansions and a handful of chapter packs atm. Open to getting more if will help my deck

One issue, first: you've got multiple restricted cards (if you haven't heard about this, you're only allowed one restricted card in a deck, though you can have up to three copies of your chosen card - you can find the restricted list on p. 6-7 of the FAQ, found here). Now, if you're just playing with friends, and you agree to not worry about the restricted list, then that's fine. But other opponents will probably cry foul.

For Joust format, Orphan of the Greenblood and the Viper's Bannermen are restricted; for Melee format, the Red Viper, Viper's Bannermen, and Make an Example are all restricted. For both cases, I'd recommend dropping the Bannermen: they're great for card advantage, but they're awfully expensive. Tyene Sand should make a good replacement - she's much more affordable, and she'll buff your Sand Snakes with stealth. For Melee, you'll need to cut another, and I think I'd drop Make an Example. It's great for the final rush, but Red Viper is such a strong character that I think he'd hurt more to lose. In its place, you could swap in Nightmares, which is pretty much never a bad choice for an event slot, or just don't replace it to bring your deck down to 60 cards.

I assume you have City of Spiders for the 2-claim, but since you're not running any other City plots, its text box is effectively blank. If you want a 2-claim plot, you might want to go with Power of Arms instead. It has much better gold, better initiative, and it'll at least give you a little boost if House Dayne Reserves happen to be in play. If you don't need the 2-claim (and with Arianne, it's really not necessary), Power of Blood will protect your two best characters, and Red Wedding can be good for both board control and power gain if you time it right.

As for getting some new chapter packs, I'd consider the two most recent: Forgotten Fellowship, and especially A Hidden Agenda. FF gives you Obara Sand, who synergizes with both Sand Snakes and The Red Viper, and has a War crest to boot if you decide to go with Power of Arms. AHA is even better: Summoned by the Conclave is a great replacement for Summoning Season, since it will often be a one-sided character search. Southron Heiress gives you another non-unique Sand Snake, and also works well with Red Viper. And Alleras is amazing for shutting down one challenge per turn, while also giving you an easy unopposed win if you're going second. It also gives Martell a unique agenda, but that might require a little more retooling of your deck to support (and it would make Alleras and Summoned by the Conclave pointless).

Anyway, I hope that helped, and good luck!

Thanks Will look into all those points.
Only played once out of the house once so still getting my head around it.