Magician's Valkyria

In Yu-Gi-Oh! the Movie: Pyramid of Light, Yami Yugi summoned "Magician's Valkyria" and equipped her with "Mage Power". He then set two cards face down in his Spell/Trap Zones, boosting her ATK by 1000. He then had her attack Kaiba's "Blue-Eyes White Dragon", but Kaiba activated Attack Guidance Armor, diverting the attack to his "Peten the Dark Clown". When Peten was destroyed, he activated his "Deck Destruction Virus" (also known as Genocide Virus; not to be confused with the Deck Destruction Virus of Death or "Crush Card Virus") to send ten cards from Yugi's Deck to the Graveyard (among them was the "Dark Magician Girl"). Yugi then passed to Kaiba. On his turn, Kaiba played "White Dragon Ritual" to Special Summon "Paladin of White Dragon", which attacked and destroyed "Magician's Valkyria".

Valkyria's presence in the Graveyard later aided the effect of "Sorcerer of Dark Magic" to lower the ATK of an opponent's monster by 500 points for every Spellcaster in the Graveyard. (Note: The actual "Sorcerer of Dark Magic" card does not have this effect.) This allowed him to defeat Kaiba's "Blue-Eyes Ultimate Dragon".