Kayle, Viridian Guardian

When Kayle, Viridian Guardian enters the
battlefield, you may search your library for an
artifact card and reveal it. Shuffle your library,
then put the revealed card on top of it.
Metalcraft — Kayle gets +2/+2, has flying and is
an Angel in addition to its other types as long as
you control three or more artifacts.
The power of ancient relics fuels her blade.