It wasn't a combo that I had to deal with when I first started out playing. Being a new person and learning basic casual magic was interesting on its own. The guy who taught me, well his girlfriend also played. There was this 1 card that she played and it would always
dominate our games. Not knowing about wraths, removal and such at the time but I had learned to deal with was
Hero of Bladehold. However later on in my casual magic playing I kept playing against this friend who had a
reanimate/recursion deck. Every time I played against this deck it would always win. Not knowing on how to deal with reanimation/recursion at the time would probably be the first combo I didn't know how to deal with