I've been playing an unholy amount of Duel Links, and i've been building T.G's in it. I decided to build T.G's in the main format, and holy fuck, they are powerful.
Nearly every monster has a special summoning condition, meaning you can easily swarm a fuck ton of monsters onto the board and climb into huge Synchros. Additionally, due to the T.G's all having varied types and levels, you can play f o u r generic searchers, and that's just for the T.G's Fucking four.
Overall, T.G's are surprisingly fucking insane, and can perform incredibly powerful Halq combos and beat people's shit in.
also, the main core is incredibly cheap, under 30 dollars, which is really nice.
A good tech could be Fleur. Have fun.