There have been a million cards made that feature 2 players on the same card. The Topps Stadium-Club Cosigners set that began back in the 90's was one of the first "chase cards" for me.
Often the players paired have very little to do with each other, but occasionally certain pairs come along that belong together.
In the pickup thread, [MENTION=2078]bigalbert[/MENTION] posted a Machado/Ripken dual autograph card he picked up which of course pairs the past and present of the Orioles, both players on the left side of the infield etc.
Which other pairs that include players playing today would be epic (it is ok if they've been featured on a card together already).
These are the ones I came up with:
Kershaw/Koufax - the comparisons are constant and deserved. Both dominant lefty pitchers, both class acts, and both of course pitch for the Dodgers
Machado/Ripken (mentioned above)
Trout/Harper - Both generational players whose careers have been compared from day 1. Different personalities, but each is a mega-star and can change the image of baseball for the next 15 years
Chris Sale/Pedro Martinez - Maybe a little early, but each came to Boston and struck out everyone around
Who do you have?