yea my bro i've been farming for last gamble til i gave up i got roll'n'boost and luck on your side + i've been farming hhg a while ago but than i gave up i have all skills from mai except hhg and just get 15 gems when farming as her. I'm kinda starting to give up on farming it's just worthless for me.
Well, the best deck to you is use the cards you have, take your time thinking in what you have that you can use, ppl say about HHG, and other skills, but there is many OP skills, such as balance, 0 life cost, parasite infestation, or simple yami, or peak performance... The decks here isnt to F2P, but helps in ideas
Depends on how you define f2p, but I honestly feel that Naturia's are pretty good. They're like a more consistent, but weaker version of Red-Eyes beatdown. The fact that one guy/gal made it to KOG with them is a testament to how strong their swarming capabilities are. Cute and deadly lol.
The best variants of GK use multiple copies of both Soul Exchange and Double Summon, which you're not likely to get as a f2p player. Something like Mako Hammer Shark is an easy deck to make since it just requires Hammer Shark from the trader, then a few Needlefish and Yomi Ships, which only means going through Age of Discovery 2 times at most. Other than that it just runs generic S/T support