I deleted the app a few weeks back, spent about $3 all up to get a Red Alert and someone else, not because theyw ere good cards, but because I loved the artwork.
As others have said, you cannot get the top cards without shelling out big bucks and ridiculous amounts of time. I feel sad and sorry for the people shelling out triple digits plus for digital artwork.
Release a real cardset of these and I'm all over it, until then, will not even think about it again.
Looking For: Wreckers Saga TPB Collection (with Requiem)