Umbral Horror Will o’ the Wisp (JOTL-EN014)

When this card is Normal or Special Summoned: You can target 1 "Umbral Horror" monster you control or in your Graveyard, except this card; this card's Level becomes the current Level of that monster. When this Attack Position card is destroyed by battle and sent to the Graveyard, and was in face-up Attack Position at the start of the Damage Step: Destroy the monster that destroyed this card.

Fiend / Effect, Judgment of the Light