D/D Count Surveyor - Battles of Legend: Monster Mayhem

[ Pendulum Effect ] Once per turn, if you Pendulum Summon a "D/D/D" monster(s): You can target 3 monsters your opponent controls with the same Type or Attribute as each other; Tribute 2 of those 3 face-up monsters, and if you do, the third gains ATK/DEF equal to the total ATK/DEF the Tributed monsters had on the field. [ Monster Effect ] You can discard 1 other "D/D" monster; Special Summon this card from your hand. If this card is Normal or Special Summoned: You can add 1 "D/D" monster with 0 ATK or DEF from your Deck to your hand. You can only use each effect of "D/D Count Surveyor" once per turn.