Since the World Series permanently moved to a best of 7, there have been 33 Game Sevens (there were two determinative game sevens prior; edit, now it's 34 game sevens plus the two prior) which I'd argue is the height of human endeavor. If it seems like its been awhile since we've had one (2002, although I can't recall how that turned out) you're right. The last 8 game World Series was 1921, so since the permanent switch to a best 4 of 7 in 1922, this current 9 year span since we've had a Game 7 is the longest ever.
I don't know if that's Wild Card related, but if you broaden our look, it might be. In the 17 years since the Wild Card, there have been 3 Game 7s (02, 01, 97). In the 17 years previous, there were 6.
The Cardinals have been in 10 of those Game 7s, almost a third. At 7-3, they've got the most Game 7 wins of any team in baseball history.
Here are the Top 10 Game Sevens in World Series History.
10. 1955 Dodgers 2 Yankees 0
-This is the first title for the Dodgers; Brooklyn had lost the Series in '16, '20, '41, '47, '49, '52, and '53.
The Dodgers were up 2-0 through 6, then withstood the Yanks getting 2 on with one out and Berra/Sauer at the plate; defensive replacement Sandy Amoros robbing Berra's seemingly game tying line drive to the left field corner (at 5:29)
9. 1975 Reds 4 Red Sox 3
-The famous game is Fisk's the night before, but the Sox took a 3-0 lead into the 6th in Game 7 giving them a win expectancy of 85%. Perez hit a two run homer in the 6th, then the Reds tied it in the 7th and had the bases loaded for Bench who fouled out. Morgan singled home Griffey in the 9th (at 14:15)to give the Reds the lead, and the Sox went down in order in the bottom half. Boston didn't get a hit after the fifth.
8. 1925 Pirates 9 Senators 7
-The greatest pitcher who ever lived was staked to a 4-0 lead and threw a complete game. But it was a complete game loss in which he (he is the Train, Walter Johnson, then 37 years old) gave up 15 hits. Still, Johnson was 4 outs away from the title, with no one on, 2 out, and a 7-6 lead in the bottom of the 8th when three doubles beat him.
7. 1946 Cardinals 4 Red Sox 3
-This is Slaughter's mad dash; Enos Slaughter scoring from first on Harry Walker's line drive base hit to center with two outs to break the 3-3 8th inning tie. The Sox had just tied it with two in the top on a Dom Dimaggio two run double. Boston put the first two on in the bottom of the 9th but couldn't plate the tie.
6. 1962 Yankees 1 Giants 0
-Richardson catches McCovey's liner at 7:45. It's the best San Francisco Giants team of all time; we didn't get a hit until the 6th, with Mays and Alou both in scoring position with two out in the bottom of the 9th, McCovey's lineout ended it. 40 years later, we lost another game 7. It wasn't until 2010 that San Francisco won its first World Series. I've written about this game, and the entire history of the San Francisco Giants in the World Series, more extensively here.
5. 1991 Twins d. Braves
And none of those runs scored.
In the tenth - Gladden opened with a double, took third on a groundout, and a couple of intentional walks later was the Larkin game winner.
4. 1997 Marlins 3 Indians 2
Another extra innings
3. 1924 Senators 4 Giants 3
The greatest pitcher who ever lived, Walter Johnson, in the twilight of his career and playing in his first World Series, pitched the last 4 innings of a 12 inning game 7; the Senators scoring 3 runs, including the game winner, on two separate bad bounce ground balls. There were 7 combined errors; my guess (I don't know the answer) is that's a game 7 record. The Giants had a two run lead with 4 outs to go, reaching an 89% win expectancy, when the first of those bad hops scored two in the 8th. Frankie Frisch tripled off the entering Johnson in the 9th, but the Giants left them on the corners. The Senators had them on the corners with one out in the bottom, but a Ralph Miller double play ended the inning. Frisch faced Johnson again with the potential winning run at second and one out in the 11th, but struckout, and a second strikeout got the Senators out of the inning. Washington had the winning run in scoring position themselves in the bottom, but didn't score. In the bottom of the 12th a botched foul popup to catcher led to a Muddy Ruel double and with two on and one out, what appeared to be an inning ending Earl McNeely double play ball bad hopped into the game winning hit.
2. 2001 Diamondbacks d. Yankees
Only once has a team entered the bottom of the 9th losing and exited it with a World Championship.
It was 2001. It was November. And it Mariano Rivera was on the mound.
You can see the entire bottom of the 9th here. The two starting pitchers, Clemens and Schilling, combined for 19 strikeouts and only one walk. Soriano homered in the 8th to break a 1-1 tie and when Rivera struck out the side in the bottom, the Yankees were at 80% win expectancy, but presumably felt more likely than that given the context. Mark Grace led off the bottom of the 9th with a single, a Rivera error put two on, but an unsuccessful bunt attempt forced the lead runner. Tony Womack doubled home the tying run, and after a hit batsman, Luis Gonzalez singled home the win. Had the Yankees held on, the connection between this game and 9-11 would probably have marked it as the ultimate American sporting event, with only perhaps the 1980 hockey win over the Soviets to contend in our national consciousness.
1. 1960 Pirates d. Yankees
The game highlights are here.
The Pirates scored two in each of the first two innings giving them an 89% win expectancy.
The Yankees scored the next 7 runs. They ended their half of the 8th with a 7-4 lead, 6 outs away from a title, and a 94% win expectancy.
The Pirates scored 5 in the bottom of the 8th after what looked to be an easy double play ground ball bad hopped into Tony Kubek's throat. When Hal Smith hit a three run homer to give the Pirates a 9-7 lead, the win expectancy swung all the way back to 93% for Pittsburgh.
But New York came back again. Singles by Richardson/Long/Mantle cut the lead to one run and a Berra groundout tied the game at 9.
Two years later, Ralph Terry shut out the Giants in a Game 7, but in 1960, he gave up a leadoff homer to Bill Mazeroski for the only Game 7 walkoff home run in World Series history.