The texture of your hand will also dictate the piles - you might have Snapcaster in hand already, so you're fine with them discarding the good spells
Manifest was the same effect, more or less, but a little more flexible
The biggest bomb removal you can find is Aura Shards, no question about it
If other cards affect dragons and/or skeletons, we know they'll affect Bone Dragon
Paying 4 mana and sacrificing something to potentially just win the game with the right 4 mana or less card from your deck (and there are a lot of cards that can do that) is an amazing bargain, and you can run 4 of them, meaning that the combo piece you needed
You do need to be careful about casting this, as you do with most Auras, but this one does enough to be make the cut a decent chunk of the time