#2 The Undertaker's legendary WrestleMania streak
While Shawn Michaels is known as Mr. WrestleMania, it is The Undertaker who is the Superstar who has had the biggest impact on the success of WWE's Grandest Stage of Them All. You can't talk about WrestleMania without mentioning The Undertaker's legendary WrestleMania streak - something which was the biggest attraction of the year for a long time until Brock Lesnar broke the hearts of thousands of fans at WrestleMania XXX.
The Undertaker made his WrestleMania debut at the seventh anniversary of The Show of Shows in 1991 and continued to win his matches at the event year after year. Once people started realizing he's undefeated at WrestleMania, it became a huge attraction, with top WWE Superstars attempting to do the unthinkable every year, only to succumb to The Deadman in the end.
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He was once undefeated at WrestleMania with a record of 21-0, following which The Beast Incarnate became the conqueror of the streak. While the mystique of the streak was lost after that (Roman Reigns defeated him at WrestleMania 33 as well), The Undertaker's record at the Show of Shows is 25-2, something which I'm sure no Superstar will be able to break.