I downloaded this game waaay back in 2011, and am just now picking it back up (a whole DECADE later )

I'm really enjoying it again, but I prefer slow-build style gameplay and this feels like everything is decided in the first couple rounds. Are there viable "slow and steady" decks? I'm just doing campaign against the AI, so I'm not looking for anything uber competitive. But against the AI it feels like the only real way to win is quick and aggressive. Is there a set (like the humunculus cards) or hero type (Wulven, mage, etc) that is realistic for this kind of approach?

Thanks!!