Esper Esper, then, is an ally of Grixis, and must have some overlap to keep things balanced
Still, this one has its uses
Avacyn, Angel of Hope Avacyn, Angel of Hope sees some play as a reanimation target/control win condition, especially in Commander play
Black is actually pretty good at using artifacts, and Marionette Master is a hell of a finisher
I think that if you wanted to have a discard spell in the sideboard you would probably just want to be playing seven in the main deck, but if you did choose to put one in the sideboard it should be a Duress
(10/7/2022) Opponents may respond to the Fast Healing ability after it goes on the stack, but they don't get the chance to cast spells or activate abilities between the time you have chosen to discard two cards and the time Old One-Eye is returned to your hand.