Thresh, The Warden

Black Mist (At the beginning of the end step, you
may put the top three cards from your library into your graveyard; if you don't control any creatures with the
same name as this creature, return this creature to the battlefield tapped.)
When Thresh, The Warden attacks, you may put
the exile two cards from your graveyard; return
target creature card with Black Mist from your graveyard to the battlefield tapped and attacking. Sacrifice it after it attacking.