
Your opponents can't cast spells with even mana values. (Zero is even.)
Your opponents can't block with creatures with even mana values.
Void Winnower has 7 printings, first in Battle for Zendikar (2015). EDHREC ranks it #1,658 among Commander cards. It appears most in Zhulodok, Void Gorger decks (14,730 on EDHREC). 1 public deck on TCG runs it. It has 5 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.