When this card is activated: You can add 1 "Boss Rush" from your Deck to your hand. All "B.E.S." monsters and "B.E.S. Big Core" you control gain 500 ATK and DEF, your opponent cannot target them with card effects, also those cards cannot be destroyed by your opponent's card effects. Once per turn: You can Special Summon 1 "B.E.S." monster or "B.E.S. Big Core" from your hand. If a "B.E.S." monster(s) or "B.E.S. Big Core" is Normal or Special Summoned to your field: Place 1 counter on that monster(s) that can be used for its own effect.