i like it, a lower cost alternative to antimatter which is not as powerful as antimatter. can also be used similar to sonic boom and freeze, as if you antimatter and then use this, it dies the next turn.
i would suggest changing the card text to "Switch the ATK and HP of target creature. This will not effect heavy creatures." to match the notes.
this probably could have been posted straight to level 0, seems complete enough to start there.