Yang, The White Wolf

Lifelink
When Yang, The White Wolf comes into play,
you may search your library for Yin, The Black
Wolf and put it into play, then shuffle.
When Yang attacks or blocks with Yin, it gets
+1/+1 and gains deathtouch until end of turn.
At the beginning of your upkeep, if Yang is in
your graveyard while Yin remains in play, you
may return Yang to play.