The fact that you have to wait until your upkeep to get the effect is pretty tough given designs these days, but if you can keep it on the battlefield a few turns, it could yield some dividends
Despite having access to cheap removal spells, they also rely on impactful cards like Teferi, Hero of Dominaria as win conditions
As I mentioned at the beginning, Umezawas Jitte does too much for too little
This Weeks Trends In Standard, Todd Andersons first-place finish on The SCG Tour at the Classic the previous weekend showed the world the power of the U/R Thermo-Alchemist deck
I want you to tell me right now if when building your deck, the ratio of even-Cost cards versus odd-Cost cards is ever something you've considered outside of Gyruda, Doom of Depths or Obosh, the Preypiercer, of which Void Winnower predates both of these cards by 5 years
Throw in some additional hand-hate like Mindslicer and Sire of Insanity plus some additional free damage like Guttersnipe and you probably wont be the most liked at your table