Arcane x riftbound box content? | tcgmode

I’m new in this tcg, i play LOL for more than 10years now, and how i was liking to enter a tcg i was thinking riftbound was a good idea! i was looking what to buy and discover this box, what inside? packs? promo cards? how many cards? pls help! (sorry my english, not my first language) 🙏