"Top deck" is basically when you're playing Magic the Gathering and you don't have a hand to play with, so you're basically using just the cards you draw on your turn.
and I thought it would make a cute name.

I know I have commissions to do, but I really needed a break from drawing porn. Seriously. Too many naked ponies. I was also up all night with heartburn.... Anyway! I'm going to do a ref like this for my pony Freckle Sketch.

Freckle Sketch and Top Deck are married. x3