Will-o’-the-Wisp [Mystery Booster]

Flying (This creature can’t be blocked except by creatures with flying or reach.)
{B}: Regenerate Will-o’-the-Wisp. (The next time this creature would be destroyed this turn, it isn’t. Instead tap it, remove all damage from it, and remove it from combat.)

“On dark nights you can still see the light of the Vess girl’s lantern out in the Caligo, seeking her lost brother. Those who follow are doomed to join her endless search.”
—”The Fall of the House of Vess”