Let's discuss about the cards ranking in term of competitiveness for PVP.
Notice that I'm not a that good player, so if you do not agree just explain why.
Reanimation, Reincarnation, Immunity, infiltration and offensive burst skills are considered to be the standard threats, so that skills such as exile or ice armor are somewhat countered.
So I propose that we start to discuss with Forest cards.
A Rank: Core cards of the deck
Easter Bunny: (810/1720) A+ especially anoying with double reanimation (lv 115 reward is Easter Bunny with quick strike reanimation). Paired with a card with reincarnation such as Monkey King, it is ridiculously easy to make infinite ressurection loop. Best support card.
Vulture Soul: (830/2010): (not sure of the rank, I don't have the card myself but it was a pain for the 15 world map) clean sweep + infiltrator make it destroy the field, exorcism is a bit weird but this card could be even more tremendous withs resistance or concentration as 4th skill.
Golden Fafnir: (805/1990) : Powerfull burst with infilitrator+ immunity
The Holy Elf Priest: (880/1770) A-, Reincarnation support + self revival are good enough!
Asteria: (805/1920) same thing, summon skill and immunity are interesting through.
B Rank: Above average cards that actively bring your deck to victory.
Fafnir: Used to have one of the single best burst but completely walled by ice armor and it's 50/50 against dodge. Immunity is good through, Parry is decent. wait time is a a bit high.
Rhea: (785/1845): nice artwork! And pretty good, ice armor and resistance made it solely vulnerable to infiltrator and massive use of ice/thunder/poison/etc to a lesser extant.Magic erosion also bring valuable support
C Rank: Decent cards that can still be used to complete your deck.
Godess of flower (885/2045) C+: really good support but only to adjacent cards, reincarnation lv 1 is a bit weak through.
Spring Godess(865/2140): Clean sweep + swift is rather decent especially against thunder shield, but a bit situationnal, would rather use vulture soul.
Artemis: (850/2025): Not really good in PvP as you can't quick strike teleportation when you want, Healing quite good through. Too much resistance/Immunity in PvP also to really be effective
Dream Godess: (925/1900) I think Rhea is better, her stats and magic erosion lv are superior to Rhea but lack of resistance is annoying.
Fairy Queen: (755/1755) bring really nice support to forest cards but quite limited a part from this...
Gaia: C-(810/1800) Bring good support, especially trap but evasion, immunityand counter effects runes are a bit too persistant
Rain Summoner C-: (765/2060) Another forest supporting card, confusion is a bit too unreliable imo.
D Rank: Not really good in current meta or too situational, won't use those card except if no alternative.
Fire Drake: (890/1620) quite fragile, Blitz + Fire god combo is quite unreliable.
Phoenix: (820/1690) My 1st five stars card... Too much reflection/magic armor/immnity to make fire storm powerfull. The fact that its' other skill does not bring support to the team make this card rather bad.
Kirin (755/1730) Very weak skills a part from Chain attack..; stats are also quite weak, maybe the worst card of the list.
Phantom Wing Leia (875/2010) : haven't seen it but seams pretty weak.
Aries (715/2290): Still haven't seen this card on my servor
Curlew:(880/2020) ? Not really sure of its rank, CD reduction is decent but not sure if worth for anything else than 6 CD cards
Twilight Guardian: (835/2020): do quite nothing a part from healing itself and doding attack (haven't seen it yet too)