Card Errata:Imperial Ace Knight

Actual text:

* This monster cannot be Normal Summoned or Set. This monster can only be Special Summoned by Tributing "Queen's Kinght", "King's Knight" and "Jack's Knight" you control. When this monster is Special Summoned, you can destroy all monsters your opponent controls and inflict 800 damage to your opponent for each monster destroyed this way. If you activate this effect, you cannot conduct your Battle Phase this turn.