Vex Harpy

{t}, Sacrifice Vex Harpy: Search your library for a
basic land card, put that card onto the battlefield,
then shuffle your library.

{t}, Sacrifice Vex Harpy and a land: Search your
library for a land card, put that card onto the battlefield, then shuffle your library.

"It swam back and forth through the air, spinning,
the single red eye looking - I realized - for me."