Hearthpwn

This deck looks a lot like twitchrarran's Legend FlameWaker mage with some minor differences.  I'm also experimenting with that deck and am also considering adding primordial glyph as you did. I also considered Ice Lance as a way to add more damage to Ray of Frost. I assume you dropped Bloodmage because you don't have him. Completely understandable. The Banana Buffoon kept adding too many cards to my hand so I understand dropping it as you did.  Where I disagree is Witchwood Piper.  Especially now without Thalnos you're cheapest minions are ALWAYS going to be Sorcerer's Apprentice or Mana Cyclone usually whichever you are missing for the combo.  I personally think it's worth the 100 dust.  I would drop Ice Block works well in other decks but here you either have lethal or you don't one turn extra usually won't help.  If you keep the ICE Block I would add a pyroblast or fireball for that next turn lethal after your trap goes off.  I would think this would happen by missing lethal on the one turn kill combo then the opponent responds with board clear or killing you or both.  Rarely will he be able to board clear trigger the ice block and heal enough to escape pyroblast on the same turn.