That's an unusual effect for a Boros card, but also a very intriguing one, especially with Impact Tremors effects in play
Milling half of your opponents deck is certainly going to annoy a lot of people, but its probably little more than flavor text since it wont mill enough cards to make enough of an impact on the game
This works a lot like the recent Digimon Card Games security system, in the way that it can occasionally spring interesting traps on your opponent as youre losing health, often making damage-dealing just as suspenseful for the one dealing damage as the one receiving it
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You may find that if you are a hard control player, dont want to play creatures, or prefer combos as your wincon you are out of luck, at least early in the season