Will-o'-the-Wisp [Collectors’ Edition] XY51 during damage calculation (in either

during damage calculation (in either player's turn): You can detach 1 Xyz Material from this card once per battle

If this face-up Attack Position card battles an opponent's monster

When this card attacks a monster in defense mode

look at the top two cards of target player's library

Will-o'-the-Wisp [Collectors’ Edition] XY51 during damage calculation (in eitherSet: Collectors Edition Type: Creature Spirit Rarity: Rare Cost: {B} 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.) "About, about in reel and rout The death fires danced at night; The water, like a witch's oils, Burnt green, and blue and white."