Voloferniges, the Darkest Dragon Doomrider (DAMA-EN045)

2 Level 7 monsters

Once per turn: You can detach 2 materials from this card, then target 1 face-up card on the field; destroy it, and if you destroyed a monster, you can make 1 face-up monster you control gain ATK equal to the destroyed monster's original Level/Rank x 300 until the end of the next turn. This card cannot attack the turn you activate this effect. This is a Quick Effect if this card has a Dragon monster as material, but cannot be activated in the Damage Step.

Dragon / Xyz / Effect, Dawn of Majesty