Valkyrie

Flying, vigilance, haste
Whenever Valkyrie attacks for the first time each turn, untap all creatures you control. After this phase, there is an additional combat phase.
"I don't plan to stop drinking. But... I don't wanna forget. I can't turn away anymore. So... if I'm gonna die, well... it might as well be driving my sword through the heart of that murderous hag."
- Valkyrie