Show: All formats Goat Perfect Circle Edison
Your opponent can still Flip Summon a monster.
(1) If there is 1 or more monster(s) on the field of the controller of this card, his/her opponent cannot place a monster on the field if his/her number of monsters would exceed the number of monsters that are on the field of this card's controller. (C) The cards that are already on the field before this card's activation are unaffected by this effect.
If there are already more monsters on your opponent's side of the field when you activate "Kaiser Colosseum", nothing happens to your opponent's monsters but your opponent cannot Summon any more. Also, if the number of monsters controlled by "Kaiser Colosseum"'s controller is reduced, the opponent does not have to remove any of his monsters.
The (1) Continuous Effect only applies while you control 1+ monster(s).
Your opponent cannot use "Monster Reborn", "Scapegoat", etc. while "Kaiser Colosseum" prevents him from placing new monsters. However, your opponent CAN use "Change of Heart", "Snatch Steal", etc.
Your opponent can still activate Brain Control / Mind Control.
If all monsters of "Kaiser Colosseum"'s controller are destroyed, "Kaiser Colosseum"'s effect no longer functions until that player has at least 1 monster again (when the effect re-activates).
Your opponent can Tribute Summon if they would then control equal / fewer monsters than you do.
If the player who controls "Kaiser Colosseum" has his only monster taken by the opponent with "Change of Heart", then the opponent can place more monsters because "Kaiser Colosseum"'s effect is no longer active until the player has at least 1 monster again.
Your opponent cannot Tribute Summon if they would still control more monsters than you do.
When "Kaiser Colosseum" is active, and "Cyber Jar" is activated, if your opponent would control more monsters than you, your opponent has to destroy monsters equal to the difference; the excess monsters are never actually Summoned and instead are sent from the Deck to the Graveyard (so "Witch of the Black Forest" does not get its effect, etc.). So the monsters are destroyed after they are picked up, but before any monsters are Special Summoned for the effect of "Cyber Jar".
Your opponent cannot activate cards / effects that Summon (ex: Scapegoat, Call of the Haunted).
While you have "Kaiser Colosseum" on the field, your opponent can Tribute Summon, if after the Summon they will control less or an equal number of monsters as you do.
The (C) Condition cannot be negated. It is not an Effect.
If there are already more monsters on your opponent's side of the field when you activate Kaiser Colosseum, nothing happens to them but your opponent cannot Summon any more.
If there are already more monsters on your opponent's side of the field when you activate "Kaiser Colosseum", nothing happens to your opponent's monsters but your opponent cannot Summon any more. Also, if the number of monsters controlled by the controller of "Kaiser Colosseum" is reduced, the opponent does not have to remove any of his monsters.
If all monsters of the controller of "Kaiser Colosseum" are destroyed, the effect of "Kaiser Colosseum" no longer functions until that player has at least 1 monster again (when the effect re-activates).
If the player who controls "Kaiser Colosseum" has his only monster taken by the opponent with "Change of Heart", then the opponent can place more monsters because the effect of "Kaiser Colosseum" is no longer active until the player has at least 1 monster again.