The Mana Energy is one of two indicators exclusive to Mana Monsters, the other being the Mana Count. It is represented by a gold crystal in the shape of a star, and is located on the right side of the box containing the Mana Effect.
The Mana Energy is used to determine the Mana Summon the Mana Monster. (For example: if a Mana Monster has a Mana Energy of 7, the player must Tribute 1 face-up Level 7 monster they control.) The Mana Energy can also be used as a substitute for a Level, should the Mana Monster be attempted to be used as a Tribute or for a mechanic that requires Levels (namely , , or ). For instance, an Energy 8 can be Tributed for the Ritual Summon of a Level 8 or lower , and an Energy 5 Mana Monster can be treated as a Level 5 monster for a Synchro or Xyz Summon.of the monster to be in order to