Welcome to Elements, royalfishness and Zenith76.
As you've noticed, devourers are quite powerful, and, on the face of it, are capable of completely dominating the game.
As you get more experience, you'll see that the most diabolical thing about Elements is that there are a LOT of cards which seem that way. The amazing thing is that the many different cards, each of which individually seem game-breakingly overpowered, keep each other in check. And that's what's so beautiful about Elements.
Yes, your enemy has a game-breakingly overpowered card. But so do you.
A famous philosophical paradox asks: what happens when an unstoppable force hits an immovable object?
In Elements, unstoppable forces hit immovable objects almost every single game. And the answer to the paradox is: an awesome game happens.