There have been plenty of creatures that bleed your opponents out as creatures die, but Blood Artist popularized the ability, and paved the way for an endless wave of clones and spin-offs
Even if you've not traditionally been a TCG collector, I can imagine that this Marvel collaboration is going to be an MTG gateway drug for a lot of fans
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Doesn't more choice lead to a better game
Sure, you could do this with a warped All-Fates Stalker, but that one mana is the difference between a card that doesn't get much hype and one has quickly risen up as one of the best mythic rares in the entire set for the likes of Commander
Since Erata is unblockable, you can use them to enable any ninjutsu abilities without fail