Dark Angel (Ire) and Invincible Army (Ire) may not be the only exciting stallions at Yeomanstown Stud with David O'Callaghan outlining his hopes that Shaman (Ire) can lay down a marker at Goffs this week when some of the Group 2-winning son of Shamardal's first foals go through the ring. A colt foal by Shaman fetched €22,000 at the inaugural Tattersalls Ireland Sapphire Sale on Saturday and O'Callaghan thinks the best is yet to come from a sire who is due to have 22 foals go through the ring over...