Premier Adelaide jockey Jamie Kah has already landed one of trainer Jack Duncan's biggest wins and is set to deliver a much bigger prize at the Gold Coast.

Kah will ride Magnufighter for Duncan in Saturday's Magic Millions Guineas and the gelding has attracted some support at long odds in the $2 million race.

Duncan has had a steady stream of winners since moving from Tolga in North Queensland with horses such as stout stayer Hot Saga.

He has been in great form of late with four winners since Christmas Day.

Kah helped Duncan get one of his biggest wins when she rode Stonecast to take the $100,000 Provincial Series final at Doomben two weeks ago.

She also rode Magnufighter when he as an unlucky last-start fifth behind Guineas favourite Pierata in the Group Three Vo Rogue Plate at Doomben two weeks ago.

Magnufighter was one of the few horses on the day to make ground in the straight after coming from tenth on the corner.

The winner of three of his nine starts Magnufighter has competed in top class, finishing four lengths from the winner when unplaced in the Group One J J Atkins Stakes in June.

"When I learned Jamie was coming back for Millions Day I was quick to book her," Duncan said.

"I have set Magnufighter for the Guineas but we were worried he might not make the field. He is on his game and won't disgrace us."

Kah will also ride Crockett for Tony McEvoy in the Magic Millions Classic.