Always love asking this question...

You can pick ANY sports card, piece of memorabilia, TCG or comic book under the sun and it's immediately yours... BUT there are rules.

You can't sell it, you can't profit off it in any way, and when you die, the card magically goes back to wherever it came from... so money/value has no bearing here.

What would it be and why?

Me? Probably the Jackie Robinson 1948 Leaf card.