Wayne is basically referring to life as a game here, a card game, to be specific. Maybe a bit of a play on his “Life’s A Gamble” tattoo.

(Tattoo located near Wayne’s left shoulder, or the viewers right)
So, even if Wayne isn’t dealt a card that has a king on it

He himself will still feel like a king.

Not being dealt a king card probably refers to not always having things go as planned, but since Wayne still feels like a king, it obviously doesn’t bother him too much.