The seven-year-old is unbeaten in three races over fences this season at Catterick, Market Rasen and most recently Warwick last month.
His run at Warwick ended Paul Nicholls-trained Black Thunder's 100 per cent chase record and McCain has tipped Corrin Wood to sparkle on Cheltenham's grand stage.
"His jumping is very slick and economical, but the handicapper has taken no chances in putting him on a mark of 156," he said.
"That won’t matter much for his next run as that’ll be in the RSA Chase where he has to be a serious challenger.
"He always looked a decent prospect as a novice hurdler but if you know the horse you’d realise he was always going to be a chaser."
Also on McCain's books is six-year-old gelding Indian Castle, who he believes could also be in line to spring a surprise at Cheltenham.
"He has been given a mark of 140, which I think is very fair," he added. "I'm not sure which handicap he'll go for, possibly the Kim Muir, but I like his mark and he won't be making up the numbers."
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