Paying life to draw cards is one of the most powerful things you can do in Magic—just look at Griselbrand, who regularly ends games of Modern and is banned in Commander. Yawgmoth, Thran Physician has a similar ability, with the benefit of a -1/-1 counter and the downside (upside?) of an instant-speed sacrifice outlet.
Boundless knowledge is within Yawgmoth's grasp. Let's meet our test subjects.
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