Wildcard Troll

{r}{g}, Destroy Wildcard Troll: Place the top three cards of your library in front of you face down. Target opponent reveals one of them. If a land card was revealed this way, untap all lands you control. If a nonland card was revealed this way, draw cards equal to its converted mana cost. Then put the revealed card and the face down cards on the bottom of your library in any order.
{1}{r}{g}: Regenerate Wildcard Troll.