B.E.F. Zelos

When this card is activated: You can add 1 "Boss Rush" from your Deck to your hand. "B.E.S." monsters you control gain 500 ATK/DEF, your opponent cannot target them with card effects, also they cannot be destroyed by your opponent's card effects. Once per turn: You can Special Summon 1 "B.E.S." monster from your hand. If a "B.E.S." monster(s) is Normal or Special Summoned to your field: Place 1 counter on it.