Gottfried, Elemental Knight (1-153) [The Dawn of Valhalla]

Resonator : Elf [Break] Choose an addition in your graveyard and put it into your hand. [Target Attack] [Continuous] While this card is targeted by an addition, this card gains [+300/+300]. [Continuous] For each [Addition:Resonator] on this card, it gains [+300/+300]. (This effect is cumulative).