Honestly this deck shouldn't be considered top tier anymore. Way lower. I can't get past Silver Rank with it even. I've played yu-gi-oh for a long while so I know how to run the deck. If anyone is having success with this deck please post photos as proof. I would be very interested in seeing it it.
"a long while"? asumming u have been playing this game for a while, how can u not getting why Gambaj DT is a great deck? few things that stop Gambaj DT deck are: swarm decks, mills, Divine Knight Ishzark (because u dont get any value from blue dragon, which is one of the most important monster in the deck), and ur own luck. or maybe, u simply can't use it.
Tested a Desert Twister / Last Gamble deck yesterday and got 10 wins in a row. Made it from Gold 1 to Gold 5 and think I can go up to the Platinum Ranks.
2x Desert Twister
3x Blue Dragon Summoner
3x Warrior Dai Grepher
2x Hane Hane
1x 4-Star-Ladybug
1x Adhesive Explosive
3x Storm
3x Wild Tornado
1x Smoke Grenade
1x Big Bang Shot
I did not face a 3SD deck yet but I think it could also handle those. You can use Hane Hane, Adhesive Explosive, Big Bang Shot and Wild Tornado/Storm to get rid of the high level monsters.
Hane hane doesn't really work well because of supremacy berry but adhesive does provide an alternative if you can't set ladybug during the 3SD summon process