Combo-y deck built to abuse unleash. The two main ways to do that are miner's musket and Olyn - miner's musket hitting a 2 or 3 cost unleash unit is generally gamewinning, especially if you can recur it with through the unknown. Olyn can grab tinker unionist (usually the best pick if you have 6+ power and a relic), barbarian guerillas for relics, or black book.
If you use a miner's musket and don't draw the reduced cost card next turn, you should try to Olyn to buff the (hopefully) 1-cost unleash unit.