V Reverse: Granblue Necromancer Cocytus

To be honest, Cocytus Reverse is suck. Cost is too heavy (Discard 4? Wtf Bushi?) and the Condition is hard (You need to lock 5 Rear and you can Unlock 1 rear for an attack). Moving on, in this deck, I only play 1 Cocytus Reverse (Because he suck). You has 3 way to send him to drop that use some ability to send him from the top deck if you lucky, or use Sea Strolling Banshee ability on VC or Pirate Swordman, Columbard.

On the first turn, never keep Cocytus Reverse and Stromride Ghost Ship in hand. Just put them to bottom and re-draw. That is 2 cards you need to send to drop with the Strolling Banshee and Columbard's ability. I recommend Columbard send Ghost Ship first, then you can call him from drop and attack with 24k on second turn. Then draw 1.

Skeleton Sea Navigator to help Non-reverse Cocytus gets more drop. When you have 3 unit on back row and has Skeleton Sea Navigator, you can rest him and 1 rear in back row to send top 5 to drop then call Witch Doctor of Languor, Negrolazy to call 1 G0 to back row on 1 rest rear and you activate Skeleton Sea Navigator's ability 1 more time to send top 5 to drop. Non-reverse Cocytus will get 10k immediately and probably is 20k/1 crit. When you attack with Non-reverse Cocytus im the first battle, activate Cocytus Reverse lock all rear and ride him on. Unlock 1 front row rear and continue battle. Skeleton Sea Navigator and 2 rear will be locked so it not a problem if you rest them.

You just need to activate Cocytus Reverse 1 time. Don't need to do it for the second G3 ride. Non-reverse Cocytus or Nightrose is stronger than him. If you want to ride another Non-reverse Cocytus on Cocytus Reverse, you can activate his ability to call Ripple Banshee and SB Cocytus Reverse from your soul to drop. Then you can activate Cocytus Reverse one more time.

On turn G3 is on your VC. Always call and use Dragon Undead, Skull Dragon to attack, Ghost Ship can be replace if you are in bad luck and don't have any Skull Dragon in Drop Zone.

Some option you can do:

+ You can put 8 Cocytus if you love to play him, then I recommend Dandy Guy, Romario instead of Sea Strolling Banshee because you can put 1 G3 to your soul that make Non-reverse Cocytus can call 4 and Cocytus Reverse can unlock 2 on the first turn.

+ Witch Doctor of Powdered Bone, Negrobone is good but he discard 1 and -1 in your drop so I don't play him. If you want, just go for him.

+ I play 1 Nightrose because she can multi attack. If Cocytus has great power on second or third G3 ride but your opponent can throw Perfect Guard to stop him, Nightrose make that easier because she give all columns 10k and can has 4 battle give a lot of pressure. You can change if you want, like Parliament Shade if you use Danny Guy put 1 G3 to soul, ride Parliament Shade in the second G3 turn and you may able to have 5 attack with 2 column rear  +20k. But do not use Witch Doctor of Dead Sea, Negrobolt, he just like Cocytus has great power and can be stopped with 1 Perfect Guard, he can't call Skull Dragon from drop to RC and when you use him, you must win or you will bye bye to your drop zone because his ability.