thinking about playing again

Hi,

I'm considering starting to play MTG again after having been out for
about 5-6 years. I don't have any cards anymore whatsoever as I sold
them all, and used to play T2 (does that still exist?).

I'm having a hard time seeing through the jungle of expansions that
have been released over the past years, and am rather lost as to how to
get started again. What are the current viable sets for T2?

Thanks,

Ben