You can go aggro as this list tries to do or you can go combo and just aim to one shot people with Bidding and things(another good one to do in green with things like Survival of the Fittest)
the card itself and the set it comes from also need to be worth collecting, but if the stars align, a numbered card can be worth a life-changing amount of money
Dragon-type Pokmon were included as Colourless Pokmon cards until 2012s Dragons Exalted expansion, where they were granted their own distinct type in the card game
The important things it will teach you, however, are where your cards go, when they go in those places, what order a game goes in, etc
Moreover, even if it is on the Bench and you bring it out on 3 Energy, its still an attack and not an ability, leaving your 30 HP card vulnerable for a KO on the opponents turn