Empress Zhuyu of Xiongji

Whenever Empress Zhuyu attacks alone, she gains +2/+2, Hexproof, and Indestructible until end of turn.
If Empress Zhuyu is the only creature under your control that's untapped, she gains Hexproof and Indestructible.
She stands out in the crowd and leads with strict care. She's not called the Beautiful Jade for nothing.