Seemingly beaten in deep stretch, Irv Naylor’s Decoy Daddy made a thrilling late move that carried him to a head victory over Gustavian in the $50,000 National Hunt Cup (Gr. 3), the featured hurdle race of Saturday’s 83rd annual Radnor Hunt Races in Malvern, Pa. One race earlier, Rainbows for Luck came back from a nearly seven-month absence to win the $40,000 Radnor Hunt Cup over timber fences by a nose.National Hunt Cup: Trained by Brianne Slater, multiple stakes winner Decoy Daddy took the lead after the first two fences in the 2 3/8-mile National Hunt Cup and was jumping well for regular jockey Carol-Ann Sloan, who ridden him to victory in the Temple Gwathmey (Gr.