Safi'Jiiva, Sapphire Star

Flying, Double Strike, Menace
{x}{x}, {t}; Safi'Jiiva, Sapphire Star deals X damage to X target creatures.
{w}{u}{b}{r}{g}{10}, {t}; Safi'Jiiva, Sapphire Star deals 15 damage to each creature you dont control. Safi'Jiiva, Sapphire Star doesn't untap during your next turn or the following turn.