Gaarukk, Death Beholder

Prowess
Below of Darkness — During your attack step, if
you choose not to attack, destroy all creatures
besides this one, all tapped creatures are exiled
instead. Whenever another creature taps, destroy
that creature unless its controller pays {6}.
{3}{u}{b}{r}, {t}: Create The Doomstead Giant, a legendary 4/4 white Giant token creature with
haste, reach, and lifelink.