Gilriel, the Sundawn Martyr

Flying
Last Stand {w}{w}{w} (Gilriel, the Sundawn Martyr
gains Double Strike and can block up to 3
creatures this turn. Sacrifice Gilriel,
the Sundawn Martyr at the beginning of
the next end step. Activate this ability
only if Gilriel, the Sundawn Martyr is
blocking alone.)