Ryun the Jade Prince

Whenever Ryun the Jade Prince fights a creature
an opponent controls, exile all other creatures.
Return those cards to the battlefield at the
beginning of the next end step.
Whenever Ryun the Jade Prince attacks alone,
it gets +2/+2 until end of turn.
"From twilight, through dusk, till dawning sun, they'd
whisper mem'ries of a time when a hero did come..."
—Ballad of the Fall