Scry A low impact mechanic that simply helps up the consistency of your draws and has no impact on the gamestate at all
If you have a spell that proliferates and you dont want to choose any permanents or players for whatever reason, you can always choose none
It can effectively shut down graveyard strategies in any format, from the Dredge deck of Modern to reanimator commanders such as Sedris, the Traitor King or Meren of Clan Nel Toth (and it can be cast for free in the opening hand)
Longtime MTG players may bristle at the non-fantasy Wild West theme
If we ever do see Ragavan banned in Legacy, this will absolutely be the card to blame for it
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