Each team has a "safe zone" at the far end of the map called the Base. When you are in base, you will rapidly heal and regenerate mana. You will also have access to the card shop while in the base. You can "recall" to the base at any time by pressing B or the equivalent controller button. After a short activation period, this will teleport you back to safety.
Note: Taking damage or using an ability/attacking will cancel a recall to base.