Bad for . It steals its creatures' Immortal status after one turn OR delays the creature.
If it's bad for aether, then it's more powerful against aether, that's all. 8) You don't have to use aether cards with this, anyway.
SoP will love this card so much.
The main use of this card is renewable CC. It's true that SoP protects one growing creature, but after SoP is down the affected creature still can't attack, so that creature would become useless afterall.