Osmark, Favored Crusader

{r/w}, Reveal an Aura card in your hand: Pay the revealed card's mana cost and, if you do, put it onto the battlefield attached to Osmark, Favored Crusader.
{2}{r}{w}: Exile Osmark and all Auras attached to it. Osmark deals damage to target player equal to the number of Auras exiled in this way. At the beginning of the next end step, return each card exiled this way to the battlefield under their
owners' co