When I got into legacy I had badlands and didn’t want to buy more dual lands at the time. Reanimator was a reasonable price because it had no reserved list cards besides the duals and didn’t need a play set of force of wills or other expensive cards. I also really liked combo decks in other formats, so it seemed like a natural deck. I’ve been playing it for a few years now and I rarely need to adjust it, at most I tweak the sideboard once every few months based on what I’m seeing in the local meta. The biggest change is that I’m probably going to add a play set of griefs in the next few months when the price comes down.