There are two choices for 4. The first is Ron Swoboda, who was a key contributor to the 1969 Mets World Series victory:

However, my choice for Magic Man Number 4 will be Lenny Dykstra:

 
I chose Dykstra mostly because I got to see him play. I chose him because he was amazing in the 1986 postseason. 

In the NLCS, he hit .304/.360/.565. He hit a walk off two run homerun in Game 3 of the NLCS to give the Mets a 6-5 win. He got the Game 6 ninth inning rally started with a leadoff triple. Everyone who watched this NLCS discuss the importance of winning in six with NLCS MVP Mike Scott scheduled to pitch Game 7. 

In the World Series, Dykstra hit .296/.345/.519. Strangely enough, Dykstra was so big in big games that this was his worst ever postseason series. Dykstra lead off Game 3 in Boston with a homerun. This was important as the Mets came to Boston after losing the first two at Shea. 

When Dykstra did all of this, he was only 23 years old. It shows that it’s not an issue of experience come October. Rather, it’s an issue of who has ice water running through their veins. This is important to keep in mind because the Mets run largely rests with their young pitching. 

The young pitching has met every challenge thus far. As Dykstra shows us, they will meet the challenges they face en route to the World Series.