The amazing part of the cybernetic revolution water monsters is that now you have a reason to play umi over a legendary ocean:

T.A.D.P.O.L.E. (monster)

when this card is destroyed in battle and sent to the graveyard add any number of cards named T.A.D.P.O.L.E. from your deck to your hand.

so after you drown these tadpoles in the graveyard useing them to pay for discard effects and such. (lightning vortex, tribe infecting virus)

Des frog (monster)

when this card is tribute summoned successfully special summon as many des frogs from your deck or hand equal to the number of T.A.D.P.O.L.E. in your graveyard.

This is where things get interesting des frog is lv5. If it' lv4 from a legendary ocean then you can't tribute summon it. Important to note that it has 1900 atk.
2100 attack with umi. and it's effect swarms so you actually have 3 of those easily at one time.

des croaking (spell)
when you have 3 des frog on your side of the field destroy all cards on your opponents side of the field.

Then proceed to attack for 2100+2100+2100= 6300 damage easily

but this can only be accomplished if your running umi instead of legendary ocean.
or not even running umi or a field spell in a water deck will work to.
You can still run umi related effects such as aqua bugroth mk-3 but it will only work attributed to umi if your trying to des frog.

expect lv 6 water monsters to make a return.

This is only the beginning as immense battleship crystal core,e hero bubbleman, and mad lobster (odd) gain no real advantage in a legendary ocean.

so any water tactics on the crv cards?

I meant to post this thread in strategy tactics and card discussion can I get some admin help?