Blurred is the boundary between creator and destroyer

Reach your 5 mana treshold first and then finish the game as fast as possible. I recommend to try and mulligan for an artifact but Poison Nova, Grapple Shot, Infiltrate and Whirling Blades are good cards to start out with aswell.

PS: Gnome Hollows is your biggest problem. you can fetch Firebolts with Common Sense to deal the finishing blow to a hiding avatar (or use a Foot Soldier)