Gravebane Zombie

Gravebane Zombie is a Commander card through and through — the recursive text is only worth building around when you have a dedicated Zombie synergy package and ways to exploit repeated enters-the-battlefield or death triggers over a long game. In Pauper it's legal but unplayed; the format moves too fast for a 3/2 at four mana that only loops back to the top of your library rather than directly to the battlefield. Legacy and Vintage have no interest in Gravebane Zombie when far more efficient recursive threats exist at lower cost. Oathbreaker is the one exception where a Zombie-themed build might squeeze value out of it, but Commander remains the only realistic home.