First, get your resources up to 2-3 per color. Make sure to get some walls up, Scavenger Constructs interact well with Nog Nests.
Second, control the pants off your opponent with Kabonk, Zealot, and your various poisons.
Third, fill your board, then drop necrogeddon.
Advanced tactics include using your Crones to kill enemies while drawing scrolls with Heritage.
I'll write a primer eventually, one I get more experience.