R.B. Operation Test (DOOD-EN094) [Doom of Dimensions]

When this card is activated: You can target 1 Level 3 or higher "R.B." monster in your GY; Special Summon it. You can target any number of "R.B." monsters you control; gain LP equal to their combined original ATK, and if you do, return them to the hand/Extra Deck, then you can Special Summon 1 "R.B." monster from your hand. You can only use this effect of "R.B. Operation Test" once per turn. You can only activate 1 "R.B. Operation Test" per turn.