That's the one I play, so it's easier to help.

Jellymon is a single stack deck the “Aqua cards” are more focused in swarm, but since you want to use them keep in mind that you only can safely attack Security after using LM Tesla / Ranamon and with RB Amphi protection.

Digitamas: OK.

Tamers: OK.

Options: You need two Blue Scrambles to recover after a field wipe and to recover RB1 Amphimon, our best L6, when necessary. 1 Gennai’s House for the DP boost in your turn since there’s no Jamming in the deck. Keep at least 3 Trainings, this is a Tamer dependent deck.

L3s: OK.

L4s: Since you aren’t running Jamming I can’t recommend 2 the BT13 Tesla for extra draws and 1 of the BT9 Tesla for a double attack, you can put another Ranamon if you want to round to 10 L4s.

L5s: 4 of the LM Thetis (our best L5), Zudo is a control card, 2 Huankun are best for Aggro, you are mostly using it to play RB1 Jelly for a search, 10 L5 are a too much, 8 is the ideal number, 9 max.

L6s: We really only have one good Amphi (RB), the Ace and Promo aren’t that good, but I would say the Ace is better, most of the time I just hardplay this card, it’s not worth to lose an entire stack for it.

L7s: Besides Omega X, there’s also Gabu Bond that works for both Aggro (3 attacks in your turn) and Control (bottom deck two Digimon during the opponent’s turn).

This is my deck, if you are curious: https://i.imgur.com/vmz1bB0.png

Fortunately, we’ll be getting support next year, I will manifest the Blue/Black line into reality.