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
One interesting aspect is how this card interacts with Delirium strategies, potentially enabling the mechanic while also providing a way to recover key permanents
Each list will start on the bottom, and well then work our way up to the Number One
I could have chosen Brash TaunterBrash Taunter, and not doing so will get me scolded by my editor
Although, this one is far less optional
Renegade Krasis In an earlier era (think Call of the Herd), this would have been a chase rare