You may look at face-down cards you control at any time
In Commander, however, this card might become an auto-include in any red deck that can reliably trigger the Wizard token
Its crazy that they are so closely balanced with one another
In other words, if a creature has flying, it can only be blocked by another creature with flying
Theres always a good land to destroy youre telling me Maze of Ith doesnt have you pulling your hair out
And if both cards are nonlands, the result is the same regardless of whether we have Opt or Sleightin fact, Sleight ensures we get the best of those two cards despite them both being nonland cards, whereas Opt guarantees we get the second nonland card, which may be worse than the first