The Tesla is a Common card that is unlocked from the Hog Mountain (Arena 10). It is a single-target, medium-ranged defensive building with both moderate hitpoints and damage. It is one of the three cards in the game that can go invisible, along with the Archer Queen and Royal Ghost. Tesla retracts when no targets are within range and gains immunity to all negative effects except for the Earthquake and the Freeze. A Tesla card costs 4 Elixir to deploy.