Pure gowen starter against Guardian is tough, I hope you picked out more duals from level up, they will help a ton since she can lower their AT for the turn and make the counters less harmful.
Other than that if its like a pure pure starter, it doesn't have a very good chance against Guardian, your only bet is like G said, Fire arrow. With only 1 arrow though, you're going to have to deal with guardian being on the field the whole game. Try picking off the other units in the back, and iczer to hit his LP(whenever u were able to close guardian).
I played against a Guardian deck with a pure gowen starter before, without any mods or any SS mods at all, came down to last turn of luck with Fire tornado. Which won it for me as luck was on my side. Make sure you take advantage of the turns when your SS goes off.
Logress wrote:Gota: I just looked at your lottery logs... I officially declare you the most unlucky man on earth.