mtg prerelease cards Temur Ascendancy [Khans of Tarkir Promos] (You may cast permanent cards from your graveyard by discarding a land card in addition to paying their other costs.) Edge of Eternities Prerelease Guide

Obviously stealing planeswalkers can be very powerful, especially if you can ultimate them right away, but Callidus Assassins flash, as well as the fact that it destroys the creature rather than having your opponent get it back when it leaves the battlefield, are significant as well

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However, they will disappear once the final chapter ability resolves

WotC notes that the card promotes a lot of fun angles for Commander players, and while powerful, the green artifact can be interacted with and requires some setup to get into play