Three days of rain promise to extend trainer Joe Pride's time in the autumn Group One spotlight.

Pride is on a carnival high after Steps In Time's Coolmore Classic win and his chances of another Group One success in the $400,000 Galaxy at Rosehill on Saturday are shortening with each drop of rain.

The trainer's three runners - Rain Affair, See The World and Tiger Tees - have formidable records in the wet.

So much so, Rain Affair is the new Galaxy favourite after Snitzerland's scratching.

But Pride has just as much time for See The World and Tiger Tees and, like Sydney's weather, the trainer says his judgment is clouded about his best chance.

"Rain Affair, maybe. I don't know," Pride said. "I'm genuinely confused but I'm happy to be a little bit confused.

"I can make a compelling case for all three."

Pride admitted he was lukewarm at best about a Galaxy victory until rain arrived on Wednesday and continued through the week.

"I was praying for rain because honestly if it was a dry track I would have given only an outside chance to all three horses," he said.

"But with the wet track they are firm chances, I'm sure."

Collectively, Pride's trio have had 25 starts on surfaces rated slow or worse for 14 wins and six placings.

And Rain Affair is a standout in the going with seven wins and one placing from eight starts while he has four wins from six starts at Rosehill.

Their statistics are equally impressive at the Galaxy distance, combining for 14 wins from 31 starts over 1100m.

"On the numbers they are well placed," Pride said. "To have three in the race is a thrill, especially knowing I'm just not making up the field."

Queensland sprinter Temple Of Boom can match Pride's team for excellence in the mud.

The 2012 Galaxy winner has raced 11 times in slow to heavy going for five wins and four placings.

He is into $8.50 from a double-figure quote with Rain Affair holding the call as favourite at $6.