If you control exactly 3 non-Token monsters with the same name, and no other monsters: You can add 3 monsters with the same name as each other from your Deck to your hand. For the rest of this turn after this card resolves, you cannot Normal Summon/Set or Special Summon monsters with the added monsters' name, nor activate their monster effects. You can only activate 1 "Subsurface Stage Divers" per turn.
The effects kinda confusing but finally I get it. It's designed for archetype whose monster's name is always treated as the other one. Like Cyber Dragon and Harpie. Because no way you can add something that already has 3 copies on the field to the hand (original card)
No, the effect works like this, I'll make an example so it's easier for me to explain, and should be easier for you to understand:
Suppose I control 3 face-up Kaiser Sea Horse. I activate this card, and with this card's effect, I can add 3 Blue-Eyes White Dragon from my deck to my hand.
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