This game is just rock paper scissors except for abyss.

Low cost sword and forest is weak to 4 cost neutral ward.
But having it in your deck will reduce your combo (portal, rune) pace.

Mid cost sword will kill (portal, rune)combo. But weak to barrier (only haven have this now)

Haven is weak to abyss bane flood.

Abyss is jack of all trade. They can kill high cost (haven, dragon), they can kill low cost (with neutral), against aggro they can also vampirize.