Modern Masters 2 is likely to cut this pricetag, but that will only be temporary if format popularity grows alongside MM2s release
I like the idea of grabbing, say, Walking Ballista and Swift Reconfiguration to set up multiple combo lines at once

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9 Skithiryx, The Blight Dragon Skithiryx, the Blight Dragon is a nightmare scenario to play against
The biggest draw to the card in this context is that, when you have a card-draw engine online and all you care about is buying time to draw more cards, then Unsubstantiate helps you get around the problem of drawing the wrong counterspell
Can a Creature Without Flying Fight a Creature With Flying