Like which should i be safe keeping at x1 or x2 or which i should be really getting at x3? The card tier list here is good, but it doesn't state the quantity needed for certain decks.
KOG's decks [~ Feb 19, 2017]
Yuma and Astral
Dark Magician: deck recipe [Mar 23]
Duelist Chronicles: Battle City Showdown!
Noble Knight: deck recipe [Feb 20]
Yu-Gi-Oh 5D's Duel Links [From Sep 25!]
Dark Valkyria | Decks and Ruling
Blue-Eyes: deck recipe [Mar 8]
Harpie: Deck Recipe [Mar 24]
Pendulum: deck recipe [Mar 24]
Dual Avatar: deck recipe
Number 70: Malevolent Sin | Duel Links & Master Duel
Thousand-Eyes Restrict | Decks and Ruling
Ice Dragon's Prison
Magician's Rod | Decks and Tips
The Phantom Knights of Ancient Cloak | Decks and Ruling