Skurdiktex, Sun's Skyglory

Flying, haste, legendary landwalk, vigilance,
Whenever Skurdiktex, Sun's Skyglory attacks for
the first time each turn, untap all creatures you
control. After this phase, there is an additional
combat phase.
{3}{r}{w}Skurdiktex, Sun's Skyglory deals X damage
to target creature and each other creature that
shares a color with it. You gain life equal to the
damage dealt this way.