Kaiser Colosseum
Edison Card Text
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. The cards that are already on the field before this card's activation are unaffected by this effect.
Dark Revelation Volume 1 • 2005-03-19
No targeting
No Damage Step effect
Banlist • Unlimited
Interactions
Can a player tag out Gladiator Beasts if Kaiser Colosseum would leave them with more monsters?✓
Opponent controls more monsters than you under Kaiser.
No. Kaiser prevents any action where the end result is the opponent controlling more monsters than you.
Can a player Tribute Summon under Kaiser Colosseum if they would control the same or fewer monsters?!
Both players control one monster.
Yes. You can Tribute Summon as long as the result does not exceed your opponent's count.
Rulings
edisonformat.net
●The Continuous Effect only applies while you control 1+ monster(s).
●Your opponent can still Flip Summon monsters.
●Your opponent can still activate Brain Control / Mind Control.
●Your opponent can Tribute Summon if they would then control equal / fewer monsters than you do.
●Your opponent can't Tribute Summon if they would still control more monsters than you do.
●Your opponent can't activate cards / effects that Summon (ex: Scapegoat, Call of the Haunted).
●VS. Cyber Jar: if your opponent would control more monsters, they must destroy monsters equal to the difference; the excess monsters are never actually Summoned and instead are sent from the Deck to the GY (so Sangan does not get its effect). So the monsters are destroyed after they are picked up, but before any monsters are Special Summoned for the effect of Cyber Jar.
●The ●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 can't Summon any more.
edisonformat.com
(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.
The (1) Continuous Effect only applies while you control 1+ monster(s).
Your opponent can still Flip Summon monsters.
Your opponent can still activate "Brain Control" / "Mind Control".
Your opponent can Tribute Summon if they would then control equal / fewer monsters than you do.
Your opponent cannot Tribute Summon if they would still control more monsters than you do.
Your opponent cannot activate cards / effects that Summon (ex: "Scapegoat", "Call of the Haunted").
VS. "Cyber Jar": if your opponent would control more monsters, they must destroy monsters equal to the difference; the excess monsters are never actually Summoned and instead are sent from the Deck to the Graveyard (so "Sangan" does not get its effect). So the monsters are destroyed after they are picked up, but before any monsters are Special Summoned for the effect of "Cyber Jar".
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.