The irony leaves Brian St. Pierre scratching his head in amazement.Here he is ? a product of the Pittsburgh Steelers system. He was drafted by former coach Bill Cowher, nurtured by him, saw Ben Roethlisberger leap past him in 2004 en route to his sensational rookie season ? and he’s going to the Super Bowl with the Arizona Cardinals.”The irony of it all is almost too much to take in,” says the former St. John’s Prep and BC quarterback, who is third on the depth chart, behind Kurt Warner and Matt Leinart. “I’m in the Super Bowl, playing against Pittsburgh. It’s definitely special, and it’s more special because of who we’re playing.”Needless to say, he’s heard the name Roethlisberger a lot this week, as in “how does he tip off whether he’s throwing a pass or handing the ball off,” or “how can he telegraph his snap counts.””Our coaches have approached me about (revealing some of the things he observed by practicing alongside Roethlisberger for three seasons),” said St. Pierre, a Danvers native. “I was in the same meeting room with him for three years. They’re looking for little, subtle things.”St. Pierre approaches next Sunday’s game with a lot of mixed emotions. First, and most important, he wants his team to win.”I want to cherish the moment,” he said, “but you want to win the game. Nobody cares who loses it.”I’m all in,” he said. “There’s no question that I want to do everything I can to help this team succeed. And even if there’s not much of a chance I’ll play, if I do, I’ll go from being a non-factor to playing one of the most important positions in sports. So while you have to give your defense the best looks you can of what the opposing team likes to do, you still have to get ready yourself.”But against this backdrop, however, St. Pierre still wants to PLAY football. Somewhere.”I know I can play in this league,” he said, “and sometimes it’s a struggle to deal with (being the designated third-string quarterback). I have to believe that if I work hard enough, I’ll get my chance.”One thing’s for sure. St. Pierre prides himself on being ready to do whatever the Cardinals want – up to, and including, advising his offensive coordinator what plays to call.And his clairvoyance turned out to be quite the bonanza for the Cardinals this past Sunday in the NFC championship game against the Philadelphia Eagles.You might recall the flea-flicker in which Warner lateraled to J.J. Arrington, who then lateraled back to Warner. The veteran Cardinals quarterback then threw a bomb to wide receiver Larry Fitzgerald, who stumbled, but then righted himself to run in Arizona’s second touchdown.”Todd Haley told me the night before to tell him when it would be a good time to call it,” St. Pierre said. “He put it on me to let him know. So right before, I went over to him and said it would be a good time for the play.”It wasn’t just a shot in the dark. The Cardinals, St. Pierre said, had run a similar formation in the first quarter and, by the way Philadelphia reacted to it, “the situation was conducive for the play.”My heart was beating pretty hard when I told him to do it,” St. Pierre said. “My neck was on the line. He was legitimately asking for my input. He trusted me.”St. Pierre says he’s never heard University of Phoenix Stadium louder than it was Sunday, which made him admire Eagles quarterback Donovan McNabb even more for bringing the Eagles back into the game in the second half.”As a quarterback, myself, I could appreciate it,” he said. “You’re rooting for your defense to make a stop, but at the same time, you had to admire him. He couldn’t do anything but throw, everybody knew it, and he still brought them back. I have a great amount of respect and admiration for what he did.”All he wants to do next Sunday is win. He says he’ll worry about what happens next once the game’s over. St. Pierre is a free agent once the season ends, but says he’s already been approached by the team to sign an extension.”I don’t know how it’s all going to come out,