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This is....expensive. 7 mana to kill two dudes seems like it's a bad Sever the Bloodline in a format full of Pack Rat tokens, but nuking all of the auras (therefore the bestow creatures) may make this cost-effective after all. Paying 4 mana for the effect of killing a dude dead and getting its auras may be good, and scaling late into the game seems even better. Still, black has inexpensive removal and expensive removal, and it's not playing the expensive removal right now.
I am seeing $8 playsets of this right now. I didn't anticipate Hero's Downfall hitting the $10 it did, but this card is not as good as that, at least pre-rotation. What are the odds that bestow becomes such a big deal that you want this over a simple Doom Blade type effect? The next set would have to give us absolutely nothing. If you think this is the next Downfall, shell out $2 each. I am not a buyer at that price as much as I like the effect and worry about cards like Boon Satyr going forward. All in all, I haven't seen a ton I like at its preorder price.