It scales with the X value you choose, so its flexible, and it goes right into any artifact combo deck as a way to grab your win condition on the spot
Then the enchantment also costs three, and this time the ETB is for dorks with a cheap three mana cost instead of smaller powers, which are typically the same stuff, and then you draw without mana, but again, just once per turn like the Vampire
I personally pick Dina, Soul Steeper as an excellent off-ramp and can win with Exquisite Blood and a land like Festering Gulch, but I'm sure you can get more creative with near-infinite draw and a near-infinite graveyard
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And even though there were some unfortunately overpowered card drawing spells in the early days that were soon restricted, banned, or too expensive for play (Ancestral Recall, Braingeyser, Library of Alexandria) we still leaned on the artifacts