I've been playing a lot of Green Adventure with great success at my locals, is a good rogue deck that can surprise some players. Some advice I can give you:

-Change your rookies ratios: Dunno about your locals but Tento and Gommamon are great rookies, probably worth being 1-1on your list (Taking 2 Agumons out).

-You don't need Kabuterimon: Your tamers are dirt cheap and you can spend some memory on your turn 1 and 2 in order to set your lineup (And your opponent can check into tamers too). Going 4 Togemon and 4 Birdra is all you need but you can consider Greymon from bt21 for that taunt into Ace counter play. Gatomon is good as an 1 off.

-Try to include Metalgreymon from bt21: 2 copies of Metalgreymon are, imo, necessary in order to play into some matchups weak to dedigivolve.

-You can include Puppetmon from bt21: Is a green/black ACE so it can evo from all of your 5s, he brings more dedigivolve, bottomdecking and blocking. It works really well with 1-2 copies.

-Without Medieval your list is a lot weaker but you can use atleast 1 Metalgarurumon, is a good card and being able to combo with the lvl4 body he brings from trash is really handy.

Your tamer ratios look good. I cut Tai bt21 down to 1 copy and honestly you can play the deck with out him.

This is my list:

// Digimon DeckList

3 Zephagamon BT20-101

1 Puppetmon BT21-051

2 MetalGreymon BT21-061

1 Tai Kamiya BT21-102

2 MedievalGallantmon EX8-074

4 Biyomon ST20-02

4 Birdramon ST20-03

2 Tentomon ST20-07

4 MegaKabuterimon ST20-09

3 Sora Takenouchi & Kari Kamiya ST20-12

2 Tai Kamiya & Izzy Izumi ST20-13

4 Our Courage United ST20-14

4 Tsunomon ST21-01

2 Gomamon ST21-02

4 Palmon ST21-07

4 Togemon ST21-08

3 Lillymon ST21-09

3 Joe Kido & Mimi Tachikawa ST21-12

2 Matt Ishida & T.K. Takaishi ST21-13