If you are f2p just get some structure exclusive cards, like neos fusion, braveman, red eyes fusion, gatling dragon etc. If not, just get a staple or a card you realy need from a mainbox to complete your deck.
I started a new account yesterday and somehow got lucky with selectino box, chalice, TTH, super team buddy force, lyla, trunade are some of the cards i got so far. oh and also a forbidden dress it's ur but not meta. I only got one of each though but this cards may be useful so I think it's a good investment.
omg dont recommend neos fusion .keeper will get hit.u cant even play normal fav hero neos after it.thx idiot invoker for ruining legit heros decks too.it would be too expensive for me anyway.1 brave 2 keeper and 2 fav hero plus 2 koga is a lot ticket.
i told only get a SD card but now i realize they are not competetive.yeah its rarer or harder to get but what can you do with dark cav?its not even competetive anymore.i wanted to get a cav but got a floodgate instead.i would need more resource anyway for a deck like that . more swamp ,hex