December 2011 I bought the base set and the promos Envoy, Black Market, Stash, and Walled Village. I believe this was shortly after Hinterlands released. I slowly filled in my collection over the next few years until I bought Guilds and Prince in 2014. At that point, I owned everything Dominion.
During that time, I didn't necessarily buy then in order. I do remember buying the Base Cards and Dark Ages right when they released, but those were it.
Adventures and forward, I have purchased everything new as it has become available.
I think I discovered Isotropic shortly after my initial investment in paper cards and played there some.
I have played all the official online versions to some extent.
I got into Androminion shortly after I got my first mobile phone in the fall of 2012. Where I have played literally thousands of fully random games.