Seigneur Gaïa le Chevalier Implacable MVP1-FRG50

If your opponent controls a monster and you control none, you can Special Summon this card (from your hand). Once per turn, if one or more monsters with ATK higher than this card are Special Summoned to your opponent's field (except during the Damage Step), until the end of this turn, you can have this card gain 700 ATK.