Yin, The Black Wolf

Deathtouch
When Yin, The Black Wolf comes into play, you may search your library for Yang, The White
Wolf and put it into play, then shuffle.
When Yin attacks with Yang, it gets +1/+2 until end of turn.
At the beginning of your upkeep, if Yin is in
your graveyard while Yang remains in play, you
may return Yin to play.