Seems overpowered. If your oppnent has no permanent control, they lose. Even as a spell it's overpowered. You'd just play one of these to end your first few turns, depending on how many you drew, and your opponent wouldn't be able to play a single card for several turns, but they'd have to discard. They'd only get a little quanta from their mark, but if you have devourers, that doesn't matter.