*these are just suggestions:
if you just want to stick with the majority of the earth cards, i'd say you can try add in a protect artifact, few quints and aether towers.
though i think you should go check out scaredgirl's non-upgrade FG deck, its much easier to save up money (you can sell the cards you get from spin after you win) which you can use to upgrade your deck faster. Gods like miracle or chaos lord should be a good god to beat for starters.
or if you really want to try the t50s, i suggest getting a mono-fire deck consisting of fire pillars/fire bolts/ or the fire weapon if you can get one, saving up enough fire quantums and then beating them with 6 fire bolts is always fast and simple, and you wont need upgrades for the deck.
Regards,
Mashimaro