Morbid Opportunist was a preview card for PlayEDH during Innistrad: Midnight Hunt, so I love seeing this card again even though its on the cheaper side
If you don't want to combo win you can replace these cards to further a different kind of win: Want to win with Poison
This is no exception in the Commander format, in which blue can accumulate incredible value by focusing on its various strengths
Nefarox, Overlord of Grixis Nefarox, Overlord of Grixis represents a big jump in power level from the black commons and uncommons on this list
There are plenty of others in the $15-$20 range, too
(This includes disguise, cloak, and in games involving older cards, morph and manifest, as well as a few other effects that turn cards face down.) Common methods for doing this include using markers or dice, or simply placing them in order on the battlefield