[2] Cardinal threw and batted right-handed; he was listed as 6 feet 1 inch (1.85 m) tall and 190 pounds (86 kg).

After winning 14 games in the Class D New York–Penn League that season, he was selected by Houston in the first-year player draft in November, then made the 1963 Colt .45s' 28-man early-season roster out of spring training.

In his MLB debut April 11, he worked three innings of middle relief and allowed three hits and one earned run, while striking out three, against the defending National League champion San Francisco Giants.

[3] Ten days later, he made his only big-league start against eventual 1963 NL and World Series champion Los Angeles at Dodger Stadium.

But he lasted only two-thirds of an inning, allowing five runs (three earned) on three hits and three bases on balls, and was tagged with the 11–3 defeat, his only career MLB decision.