Aaron, Unicorn Hunter

Haste, Plainswalk, Vigilance
{t}{r}: Search your library for a unicorn creature and put it into your hand.
{p/r}{p/r} Sacrifice a Unicorn creature: Put one Taco artifact token onto the battlefield under your control.
{b}{u}{w} Sacrifice Aaron, Unicorn Hunter: Search your library for a "Madalyn, Captive Wife" creature and put it into the battlefield tapped until your next untap phase.