In the early game, you want to ramp up via wild growth and Darnassus Aspirant
Around mid game you want to play an Earthen scales on something with 8 attack or more but playing it on something with 5 attack or more is just fine.
Win condition: Play Barnabus, then Nourish or Ultimate infestation. Every minion you draw will cost zero so you can spam the board if you’re not afraid of board clear plays.