Wikia

Original	First Errata
The controller of this card cannot Normal Summon or Set. During the End Phase of the turn that a monster ~~on your side of the field that includes~~ "B.E.S." ~~in its card name,~~ or ~~is named~~ "Big Core", is destroyed and sent to the Graveyard, you can Special Summon from your Deck 1 monster ~~that includes~~ "B.E.S." ~~in its card name,~~ or ~~is named~~ "Big Core".	You cannot Normal Summon or Set. During the End Phase of the turn that a "B.E.S." monster or a "Big Core" is destroyed and sent to the Graveyard, you can Special Summon 1 "B.E.S." monster or 1 "Big Core" from your Deck.
Elemental Energy EEN-EN047 Added by Pcouw	Dark Revelation Volume 4 DR04-EN107 Added by Pcouw

Card Errata:Boss Rush