Is this mean to be a you-only Howling Mine, like Studying Wizards? I fear this is too efficient, but I'm not sure how big of a drawback championing an artifact is. Considering that there are many, many artifacts that cost or , it's probably not much of a drawback at all.

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Champion an artifact
When ~ ETBs, draw a card at the beginning of your next turn.
Sacrifice ~: draw a card.

I agree about this being ridiculously efficient, though, all the more given our comparison point are Honden of Seeing Winds and Staff of Nin

Ah yes, I'd forgotten about both of those cards. Those are good comparisons.

Hmm. I see. let me tweak this a little.