Because Cloudkin Seer is a flying, 2/1 Visionary, and that's a strong card
In that case, youre effectively playing with a 56% chance to win (80% * 70%), which should be better than a mulligan
It's decently popular with a good 220 decks over at EDHREC.com already
First up, I should tell you that Set Boosters are going to cost a little more than Draft Boosters (we estimate about $1 more per pack, but it may vary from region to region), but because you have the opportunity to open more rares per pack (you can open up to four rares or mythic rares in a Set Boosterboth wildcard slots, the rare slot and the foil slotand that's not even counting The List ), we expect that you will get the same number of rares and mythic rares per dollar spent as you would buying Draft Boosters
If the target artifact is an attached Equipment, it becomes unattached
It isn't the perfect removal card for any situation really but it gets the job done in most