As someone who has recently clawed his way into a group of top players that I can test with online, I know how frustrating and difficult it is to finally get a strong enough testing group going
Princess Luna From the My Little Pony world, Princess Luna is one of the cutest in Magic card form
The other major one is Collective Brutality
5 Color Legendary Matters (it's legendary as well) under Sisay, Weatherlight Captain
Satya creates tokens that are copies of creatures, but Cayth, Famed Mechanist is the real token manipulator of the deck
If you dont have the resources to get those cards in hand, dont hesitate to use Crobat V and Dedenne-GX if you can get off the T1 GX attack, it wont matter if your opponent can get cheap Prizes by KOing those Pokmon