Mana Monster

Mana Monsters is a type of Main Deck Monster Card that is half green and half black. They are also unique in which they have no Level or Rank.

They are similar to Pendulum Monsters introduced in ", in which they are both Monster Cards and Spell Cards. Unlike Pendulum Monsters, however, they are treated as Normal Spell Cards when the Duel begins, meaning they cannot be Summoned or Set directly from the hand.  In this case, a Mana Monster's Mana Effects will be applied instead of its Monster Effects.  Despite being treated as a Spell Card first, a Mana Monster's activation as a Spell Card is not'' treated as activating a Spell Card, meaning they cannot be negated by cards such as "" or "", and no one will take damage from "" or "" during Turbo Duels.

After being successfully activated and resolved as Spell Cards, they are placed face-up on top of the Extra Deck instead of being sent to the Graveyard. (Like Pendulum Monsters, Mana Monsters can cause the total size of the Extra Deck to be larger than would be allowed during Deck building.) However, if a Mana Monster as a Spell Card is either destroyed on the field and sent to the Graveyard, it will indeed be sent to the Graveyard like normal, and therefore will not become a Monster Card.

Mana Monsters have two different indicators: A Mana Count and Mana Energy. The Mana Count determines how many turns a Mana Monster must be face-up in the Extra Deck before it can be Mana Summoned. (This includes the turn the Mana Monster was placed face-up on the Extra Deck.) The Mana Energy determines the Level of the monster to be Tributed in order to Mana Summon a monster. During the Main Phase, if a Mana Monster's required Mana Count has been passed and the turn player controls a monster whose Attribute and Level are the same as the Mana Monster's Attribute and Mana Count, they can sacrifice that monster to Mana Summon that Mana Monster from the Extra Deck. However, if a Mana Monster is removed from the field, it will become a Spell Card as it was when the duel began. Because they have no Level or Rank, they are unaffected by cards that would affect monsters with Levels or Ranks, but they cannot be used as a Material Monster for a Ritual, Synchro, or Xyz Summon. Despite them being color-coded black like Xyz Monsters, they are not treated as Xyz Monsters.