They're an absolute blast to shuffle and can be effectively used for any situation constructed decks, Cube, Commander, you name it
Sure, you can draft if you want, but a draft generally costs as much as four packs - three for drafting and one for the prize pool - meaning a draft of Commander Masters will set you back around $50 each time
In any deck thats heavy on red cards, she essentially lets you draw a card for a +1, which is a really big upside on a three mana Planeswalker
I can definitely understand people not putting Yawgmoth, Thran Physician in their top five list as its only played in one deck, which isnt a dominant player in the metagame either, but the card makes the archetype and there arent too many good mono-black creatures in Modern right now
It has, however, jumped up in value by 272%, going from just $1.10 to $4.10 in the past couple of weeks, according to MTG Goldfish's tracker