It doesnt matter if they enter tapped or another land had to be sacrificed in order to get them out: Tifa doesnt care
While consistent stock on your shelves is always a primary moneymaker, don't forget to open packs to really find the expensive cards
These cards may have been promotional material for attending an event or prizes for a contest
You probably won't count on Yawgmoth too much if your only concern is to draw cards, but when looking at the whole package, Yawgmoth, Thran Physician is hard to beat
Korvold, Gleeful Glutton Korvold, Gleeful Gluttons cost reduction is pretty easy to take advantage of in Commander between fetch lands, Treasure tokens, and plenty of ways to sacrifice creatures
Sac, pain and shock lands, Sulphuric Vortex, Mana Crypt, Mana Vault, Phyrexian mana, Carnophage and so on and so on