You'll probably a have decent luck running this in a commander deck if you're playing 4 player style, someone's bound to have black
However, if you do, and all of those targets are illegal as the ability tries to resolve, it won't resolve and none of its effects will happen
Vannifar has already wreaked a lot of havoc on card prices on everything from Intruder Alarm to Thornbite Staff and I think once people realize how good she is in conjunction with other cards in the deck, there are a few more shoes that will drop soon
While Rhys doesn't have access to evasion, it can protect itself through regeneration at the cost of one black mana and one sacrificed Elf
Ive mentioned before that I think these types of decks (with a slightly lower power level) can and should be offered for a lower price
Itll also be the home for any unbanned but still powerful cards, as we saw with unbans like Gifts Ungiven and Coalition Victory being demoted from banned to Game Changers