To offset the cost of Flash itself, your cost for placing the creature into play was its casting cost reduced by two generic mana
8 Llanowar Elves Representing All The Mana Dorks 1 Mana Cost in Green Creature Llanowar Elves is not a new card to most players, it is the poster boy for the mana dork creature, a creature that can be tapped for mana just like land or many artifacts
But here is something that can help you better deal with these decks
If that creature is a Bird, Frog, Otter, or Rat, draw a card
Did you now DragonShield** inner sleeves are actually only 55 microns thick even though they are advertised as 60 microns thick
All you need to do is cast it, draw it, and cast it again to win the game