There are 16 Common Cards in Clash Royale:Arrows,Archers, Barbarians, Bomber,Cannon, Fire Spirits, Goblins, Knight, Minions, Minion Horde, Mortar, Royal Giant, Spear Goblins, Skeletons, Tesla and Zap. When unlocking Chests, the chances of winning Common Cards are very high. Common cards have 13 levels. They can be donated and requested from Clan members.Among them, the Arrows and the Zap are Spell Cards. Archers, Barbarians, Bomber, Fire Spirits, Goblins, Knight, Minions, Minion Horde, Royal Giant, Spear Goblins and Skeletons are troop Cards. Cannon, Mortar and Tesla are building Cards.