Isis/Ishizu is one of my favorite characters in the anime, and since her signature card doesn't seem likely to show up anytime soon, I wanted to see if I could pick an appropriate Deckmaster to use it. :)

Keldo
Group:Fairy
Type:Light
Level:4
Icon:Deckmaster
ATK:1200
DEF:1600
When a Fairy-type monster on your side of the field is destroyed as a result of battle, return the attacking monster to the controller's deck. Your opponent then shuffles the deck.

Reversed Worlds (Exchange of the Spirit in the English anime)
Trap Card
You can only play this card if you have "Keldo" as your Deckmaster. You may only activate this card if your Graveyard has 15 or more cards in it. Both players switch their deck with their Graveyard. Both players then shuffle the deck.

man that is very very nice
sounds lacking though but its just me