King Woodsie

If the skill change, the level of the skill changes too. (return to 1...)

Darn it! That means my master plan to skill up starters using chimeras won't work! Man, I had my heart set on that idea...

4x active maybe?

Suuuure

I think a 3.3x active for all the ult evos of the slimes would be reasonable

Ha, reasonable, say that to Juggler.

If you have a balanced descend team, yes, it's worth it.

His ability will stack with the leader skills of your monsters. For example, if you use two Cu Chus with 3x attack for balanced types each, then the 3x from King Woodsie will stack, leading to 27x attack for one turn.

Yes a huge help

The active skill is part of the spike team strategy where you want to launch a massive attack against, say, the boss. True, the stats are about half that of a 5+ star monster. However, consider that when you run a balanced team that has a 5000 base attack a 500+ attack gain from subbing woodsie with something else is not too significant. In my experience I can do maybe 750k attack through combos alone. With woodsie I do around 2mil easy.

His stats are indeed terrible.

However, the active skill is incredibly strong, and in a lot of descends, it will allow you to take down a boss in one or two turns. And killing a dangerous enemy before they get to do something dangerous is a life-saver.