If stranded on desert island--which one card would you want to have?

[GregMitch34]

The question of naming your top card, that you own, can be and has been asked in many ways, though often it doesn't get at what's your true favorite, with NO monetary considerations. For example, if asked which card you'd want to save from a fire (or a divorce), many would no doubt pick one that is worth a good deal, not one treasured or cherished for other reasons, such as appearance or sentiment. So my question puts all of that aside since YOU ARE STUCK ON A DESERT ISLAND, and you ain't getting off, so no eBay or BST or REA.

So pick just one and don't fudge it by picking a whole series or group or choosing 14 because you can't just decide. I wonder if someone will pick the one with the most writing on back so you'll have something to read over the next few years on that island.