It seems to me not too similar, cause:
- it´s a spell and can enchant every targetable creature
- can damage flying creatures too, but damage reduce (balance)
- its ability to damage an other creature depends on the fact, the creature needs additional Momentum or the opponent have no wall
- it can´t stun like warden
To be not too similar i also think it won´t be
. And not
, cause Momentum is needed to be sure, that the damage would not be prevented. And counter - its a creature enchantment (new ability), CC can easily kill the enchanted creature. Or maybe easier to implement the ability is only avaiable if your opponent has no shield... It seems to me more smart.