Just because you can swim, doesn't necessarily mean you can't drown.
[AUTO] Generation Break 1 (This ability is active if you have one or more face up G units in total on your (VC) or G zone) :[Counter Blast (1)] When this unit is placed on (RC), you may pay the cost. If you do, search your deck up to two "Stealth Fiend, Lake Diver", call them to separate (RC), shuffle your deck, and at the end of that turn, put the units called with this effect on the bottom of your deck.