I don't really know what the ambush ability does, but it seems like splinterlands is introducing some Ruleset and abilities these days. Great purchase. Dragon summoners are prized and this is good business for you.
As for the Possibilius it's a goal that's great. I have it at level 2 GFL and it's a very solid card. Resources are thin on my end, so I cannot build my deck..
I'm playing in wild because I can use some of my older cards. We can agree that building rebellion is very expensive