Warcry + charge + contracts to accelerate the pain. Permafrost and Shorthopper should be reserved for disabling units with high health or revenge.
Managed 4 consecutive 7/0 wins in Gauntlet and wins a fair bit in casual Throne too, but hasn't been tested in ranked yet. Feedback would be appreciated if you try it on the ladder.
Update: I tried out Frostburn as a way to ping two units with one card, but found the invoke draw to be too random and often left me with a dead card that was too expensive to play in this deck or simply not helpful. I replaced it with 2x Autotread instead. I also added Pteriax Mount as an alternative to Battlefront Dasher. I now run 2x copies of each. Depending on the situation, charge or flying may be more useful as a buff. Charge is great if you have an open lane to attack and want to sneak in damage with a unit you just played. Flying is better when the opponent has units occupying the board and you want to circumvent them.