Probaly OP..... Dara, Sphinx of Demise!

[Command Knight]

Pictures from Photobucket.com.

Pay 500 Life Points each of your Standby Phases(This is not optional.). While this card remains face-up on the field, neither player can declare an attack.

This card cannot be Normal Summoned or Set. This card can only be Special Summoned by sending 1 "Dark Prediction" on your side of the field to the Graveyard and tributing 5 monsters you Control. You can increase the ATK of this card by 7000, if you do, and you don't win the duel this turn, you lose the duel. During battle between this card and a Defense Position monster whose DEF is lower than the ATK of this card, inflict the difference as Battle Damage to your opponent.

[-DJ-]

the pics don't look very relistic

[Aonon]

Dark Prediction would be perfect as it is, for a burn deck. and the sphnix? seems to much of a risk to use. Dark Prediction definitely the winner here

[Professor Cobra]

Capitalize tributing, change Dark Prediction to optional, take out the parenthese and stuff in them, overpowered. Change 5 to 3, change 7000 to 2000. Okay pics. 5/10

[Sleepy]

Capitalize tributing' date=' change Dark Prediction to optional, take out the parenthese and stuff in them, overpowered. Change 5 to 3, change 7000 to 2000. Okay pics. 5/10

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and get rid of the loosing at the end-phase if you decide to change it. yes it does look like something risky.. 7/10