Hraesvlgr, the Giant Hawk of the Jewel Tree (2-066) [The War of Valhalla]

Resonator : Divine Beast [Flying] [Continuous] If there are no cards with the word "Yggdrasil" in its name in any field, this card's ATK and DEF becomes [300/300]. [Continuous] During battle phase, this card cannot be dealt any battle damage from dark attribute resonators. At the end of battle phase, destroy target dark attribute resonator that this card battled.