Well I decided to turn to edo's page for some research and guess wat... I just found some really broken cards....

One example is:

CHAOS SOLDIER -MESSENGER OF CREATION-
Light/Warrior/8/3000/2500
This card cannot be Normal Summoned. Remove 1 Light and Dark
Main-Type Monster in your Cemetery from the game to Special
Summon this Monster. Once during your turn, you can choose 1 of
the following effects and activate it.
- Remove 1 Monster on the Field from the game. If you activate
this effect, this card cannot attack during this turn.
- If this card destroys an opponent's Monster as a result of
Battle, this Monster can attack 1 more time.
Ultra Rare / Parallel Rare / Ultimate Rare

You just create a deck filled with both light and dark and this fella would be easily summoned~ Plus monster reborn and premature burial. Jeez...