The default deck was pretty boring for me.
Once I got to collection level 6 I had enough ongoing and 1 cost cards to make a really good deck themed around placing as many cheap cards as possible, then boosting them all with another higher cost card.
Then once I got Odin at level 14 I built another one based on reapplying all my cards On Reveal effects.
Both of those feel pretty fun to play, and the more matches I play the more I appreciate the random selection of 3 locations in each match.
It’s simplistic like the card game War but with special abilities, but there’s not another CCG I can think of that plays like this (or with anywhere near the speed of a match) which is very refreshing.