Cast Animate Dead by paying ({1} magic symbol) ({B} magic symbol) , returning Leonin Relic-Warder from your graveyard to the battlefield, and attaching Animate Dead to it.
Leonin Relic-Warder enters the battlefield, exiling Animate Dead.
Animate Dead leaves the battlefield, causing you to sacrifice Leonin Relic-Warder.
Leonin Relic-Warder leaves the battlefield, returning Animate Dead from exile to the battlefield.
Animate Dead enters the battlefield, returning Leonin Relic-Warder from your graveyard to the battlefield, and attaching Animate Dead to it.