I forgot to mention what they said in my original comment, it should be updated now
If all friendly creatures get double firepower, such as Erratic Cyclops or Talrand, Sky Summoner , the Prismari player can get ahead in a hurry
DON'T counter ramp cards (Kodama's Reach), single-use tutors (Demonic Tutor), random fatty creatures that don't have a threatening enter-the-battlefield trigger and can't attack through your drakes (Wurmcoil Engine), or anything you can deal with using a bounce spell already in your hand DO counter fatties that can't be chumped blocked by drakes (Blightsteel Colossus) if you don't have creature removal in hand, cards that make future counter magic a pain to cast (Hall of Gemstone), anything that generates excessive amounts of card advantage (Greater Good), or any card that you know has a tendency to win games in short order (Prophet of Kruphix)
This is a mashup of Leyline of Anticipation and Shimmer Myr
Here's how the decks at the Pro Tour break down
