This is my version of the top ten list.

10.)3 pieces of Gate Guardian. These pieces can take down any monster, but only once. Getting rid of two monsters may be worth it, but I would choose Sanga of Thunder because of his highest ATK.
9.)Banisher of light.  Once you defeat a monster with a magic, trap, or monster, your oppenent can't bring it back, however you can't bring any of yours.
8.)GraveKeepers Servent. Good combo with Banisher of Light. Put the monster in defense and let these two cards do the rest.
7.)Toons. Attacking direct life points could end a game easy. And their wacky.
6.)Mirror Force. I wish I had 3 of these in my deck.  Everytime your about to lose, use this to change it all. Destroys,defensive,and offensive.
5.)Magician of Faith. With her effect you can use good cards like Monster Reborn, Swords of Revealing Light, etc. Use it quickly.
4.)Monster Reborn. Reborn your toughest monster and put him in play.  With Magician of Faith you can over use Monster Reborn.
3.)Exodia pieces. Win the game. That simple. It's a tad hard to get out all 5 pieces though but in the end it's worth it!
2.)Requllished. Steal a monster and abuse it. Almost unbeatable.
1.)My #1 card isn't Rageki or Barrel Dragon for that matter, In my opinion it would me Megamorph. This is because it can change the out come of a battle really fast.