Teferi's Veil

Oracle Text

Whenever a creature you control attacks, it phases out at end of combat. (While it's phased out, it's treated as though it doesn't exist. It phases in before you untap during your next untap step.)

Card Rulings

4/1/2008 The “at end of combat” ability triggers after combat damage resolves. Creatures dealt lethal damage in combat won’t be saved this way.