Maskiell will take over from Carr on Glass Warrior in Sunday's $150,000 Tasmanian Oaks and will replace Newitt on Deroche in the $75,000 Magic Millions 2YO Classic.

The John Blacker-trained Glass Warrior was runner-up to Sydney visitor Cossetot in the Tasmanian Derby and is $4.20 second favourite in early Oaks betting.

Deroche, trained by Barry Campbell, went down by a nose to the unbeaten Mystical Pursuit in last week's Gold Sovereign and will be a hot favourite for the Magic Millions.

Maskiell, now based in Victoria, was in good form over the Hobart Cup carnival, winning the $150,000 Bow Mistress on Life On The Wire and $50,000 TAB Stakes on Hellova Street.

To complete a great book of feature-race rides, Maskiell will be on the favourite Mandela Effect in Sunday's $65,000 Magic Millions 3&4YO Classic.

"They've drawn bad barriers but I'm very confident about all of them," the jockey said.

"Glass Warrior looks the main danger to Rock Dove in the Oaks, Deroche has great form and Mandela Effect is probably the best chance of the three." 

The Oaks has attracted a field of 11 including seven interstate fillies while the 2YO Classic has a field of eight including one interstate runner.

Now in the twilight of a great career, Brendon McCoull will get the chance to win his first Launceston Cup on Wednesday.

McCoull has been booked for the James Cummings-trained Etymology, the likely favourite.

The Launceston Cup is the only major race in Tasmania to elude the 14-time premiership-winning jockey.

He won the Hobart Cup in 2001 on Brorama Star.

McCoull had his first ride for Cummings on Rock Dove when she won the Strutt Stakes in Hobart and will be on her again in the Oaks.