Catherine Elizabeth Halsey

Untap all permanents you control during each
other player's untap step.
"They let me pick. Did I ever tell you that? Choose whichever Spartan I wanted. I watched as you
became the soldier we needed you to be. Like the
others, you were strong and swift and brave. A
natural leader. But you had something they didn't. Something no one saw but me. Can you guess? Luck."
— Cortana