It grants all of your creatures that enter after it a vigilance counter, letting you keep your guard up while still playing aggressively, and also lets you trade in any three counters for a burst of self-mill and a small-scale reanimation effect
Use a Conjurer's Closet, Ephemerate, or just about any other flicker spell to keep Yojimbo from triggering that final stage, and you've got a rather gnarly 5/5 and other, oppressive effects all in a single package
Outside of their art, the cards will also include modern wording and modern corners to bring them closer in line with todays MTG releases
When meeting buyers, always choose busy public areas and bring a friend if youre handling higher-value deals
Also, it's quick (haste)
Of course, much like a few of the error types above, " Alpha corners" technically could have been shaved down by unscrupulous actors, and may not be true factory errors