^Ebil, it's been discussed in pojo a lot. There are a lot of threads on it. It's just like my Chaos Crane deck, making new cards into old decks to revamp them back.
What you do is get that level 6 gishki that lets you see two cards in opp hand and bounce one back to deck, but the thing is, you tribute a hieratic monster like su or nebthet and you get to ss a level 6 monster. Then you overlay into one of the constellar monsters and bounce another card in your graveyard back to hand (preferably shadow) and then use aquamirror eff to bounce back Gishki Gustdrake to hand and aquamirror back to deck, use shadow eff gained from the constellar monster and you get the aquamirror AGAIN. Voila. With a good hand they can bounce back ALL of your cards in hand and end up with 2700 beaters in the process that can reuse their effs again next turn (constellars)