Because you're having water orb issues on your main team and you have an underwhelming active on an otherwise very strong sub, this team and Vishnu in particular are perfect candidates for a skill transfer. You'll need two tans for each attribute of the inherited card. So for example, if Karin is w/w then you need 4 water tans and if Karin is w/d you need 2 water tans and 2 dark tans. Until the inheritance system is updated, the inherited card (e.g. karin) needs to be level 100 and fully awoken (cards that don't have awakenings yet can't be inherited without being evolved). The inherited card also has to be 5 stars and from some kind of rare egg machine. It doesn't need to be fully evolved, so a card with an 8 star UUEVO can also be inherited after it's evolved once into a six star. Besides arena and the challenge dungeons, they can also drop in alt technicals, e.g. alt castle of satan in the abyss. When a py can drop, it'll be listed as a rare drop in padx. For example, you can get a wood py here: http://puzzledragonx.com/en/mission.asp?m=844. Keep in mind that pys show up very rarely and usually don't drop when they show up. I beat all the alt technicals once and got one (or maybe it was 2?) py. If you look at the damage on your cards when you attack, any card with two attributes has two separate values, one corresponding to the main attribute and one corresponding to the sub attribute. Freyja just buffs all wood and dark attacks regardless of whether they are main or subattributes. So Freyja's wood and dark attacks are both doubled, dark attacks from Karin's sub-attribute (if she were on your team as water/dark) are doubled but not her water attacks, and balboa's wood attacks are doubled but not water attacks for his subattribute. So with an all wood team, your entire team's wood attacks (which is the bulk of your damage) would be doubled for two turns.