I sort of agree with Essence. Trying to balance everything takes too much effort. There's no real problem in having cards that are relatively unpopular. As long as elements are balanced and there's no real super tactic then it's fine imo.
As is I would say rainbow is still far and away too popular however I don't think nerfing it is the answer. I'd prefer buffing monos some way because people will complain that they can't even get 50% win against FGs anymore or at least it would be more difficult to even achieve that.
On the topic of Graboids, I think we should look at Lycanthrope/Werewolf to balance the costs. I do think Graboid is overpowered in comparing with Lycanthrope/Werewolf. Unupgraded Graboid only takes 1 for +6/0 while upgraded it only takes 1 for +8/1. Lycanthrope takes 2 for +5/5 while Werewolf takes 1 for +5/5. While Werewolf appears to add more in total, the reality is attack power is much more useful than HP; +8/1 is much more useful than +5/5. It should be obvious that +6/0 for 1 is easily better than +5/5 for 2 in the case of unupgraded versions both in terms of addition per quantum and general usefulness.
Also, for 2 Lyncanthrope/Werewolf are 1/1 pre-ability and vulnerable to being killed. Graboids are 3 for 2/3 and not vulnerable (shields aren't going to kill it before it evolves anyway).
I do not see any real synergy between Dark and Entropy that makes Lycanthrope/Werewolf any easier to play than Graboids. Yes, Nova/Supernova can help but a mark will do the job of lycanthropy just fine as is the case for Graboids and evolving.
This is actually pretty interesting to see... Especially the ones about useless cards (relics).
Kind of makes you wonder if people read half of the cards they use x,x
I made a relic farm before so I don't think that's ridiculous at all. Although people might not be in top 50 they might still have a decent chance of finding their friends or their multi account in PvP random....
No another note, how are people using Phoenix and Fractal?