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can be useful -
https://www.reddit.com/search?q=title:updated_new_dota_2_giveaway_for_5000_active+selftext:all&sort=new

Hi, I trade my pudge arcana for any 10 Dota2 loading screens - if you want send me trade offer, I will accept

Hey, I can give my Fractal Horns of Inner Abysm arcana for all of your dota 2 loading screens (Im collecting them) so if it's ok for you send me trade offer please. Link in my bio

Some guy in my profile gives his skins to everyone for some reason. He gave me arcana for free lol