I would actually advise against $$$man's suggestion, because half-bloods, in my opinion, are a waste of time. I would personally purchase the cards for a speed deck and fight against the top 50. Something like this:
4vh 4vh 4vj 4vj 4vj 4vj 4vj 4vj 590 590 5c1 5f9 5f9 5f9 5f9 5f9 5f9 5fa 5fa 5fa 5fa 5fa 5fa 5if 5l9 5l9 5l9 5l9 5l9 5l9
Immolate your Photons to summon Lava Golems, and use the other quanta to summon your other creatures. It's fast and wins against most of the top 50 decks you will face. If you come across any rare card farms, that is just gravy, because you will win with mastery, gaining a fat 60 electrum and possibly winning rares that you can keep or sell for even more electrum. You will gain electrum super fast this way, allowing you to start building an anti-false god deck.