you could probably pull it off with a AMD A10 or some thing of the likes but a 300 laptop wont do much.
if you want Intel the iris graphics (1.5 gig) will probably do it but don't expect much.
my suggestion is to spend the extra money and buy something decent, don't cheap out on laptops because otherwise they will become paperweights very quickly.
in short minecraft yes, tf2/league passably but the game play will not be good.