Overkill was leaked a while back, and most assumed it was a Limited filler card with some fun Final Fantasy flavor thrown in
There are a lot of moving parts to get them into position, but the getting swords onto heroes archetype is bound to be a strong one
The best card drawing card printed since Urza's Block, hands down, Fact or Fiction is at worst a five-card Impulse, and at the best as a three-card drawing machine
One of the coolest interactions you can do is with Chalice of the Void (where X is different from 1), casting Veil and making your spells uncounterable, blanking the Chalice
it's something black can do, but it was harder to word and less flavorful
Your opponent can respond to the ability or spell afterward, but the creature you sacrificed is already in the graveyard