A reference to the card game known as "Spades" -- where the spade suit is the deck's most powerful -- this line is suggesting that MCs lacking any power moves (metaphorically, "spades") should just give up.
three dice cee-lo and three card monte are both illegal betting games commonly played on the street in underpriviledged urban areas , Jay-Z is referencing in this song that even tho he is wipes his ass with $100 bills now, he is from "the streets".
Remember the next lyric in the song is: "If your a gangster then this is how you prove it to me...Just get violent". Jay is saying to Prodigy, who he has had beef with, prove your still a gangster, talking about hanging in the PJs doesn't make you tough.
....Mobb Deep is of course famous for their rough, gangster rap style which no longer the style of hip-hop. Jay's point is, although he is from the Marcy Projects, he no longer needs to talk about it. On the other hand, Mobb Deep has not stopped doing so.