Having a board wipe that can also just be cast as a win condition when your engine is online is outrageous, and because its an enchantment, it's going to stick around through wraths unlike the normal Blood Artists that deal damage as creatures die
They cease to be auras as they resolve if their target becomes illegal (for example, if its Murdered in response)
There is an exception for powerful cards in the Standard format, though
Horizon Explorer Lands you control enter untapped has proven to be a powerful line of text, so it makes sense that were seeing it more and more lately
To tweak Merciless Rage into a more focused Madness Vampire deck we're going to look to make the following tweaks: More ramp More Madness cards Add Vampire support cards That's what we want to add to the deck
Competitive players this gives you the flexibility in deck choice in Constructed Leagues and Preliminaries/Format Challenges to grind Qualifier Points for the next round of Showcase Challenges this weekend