What's that card with the continuous Pineapple Blast like effect?

The closest I can think of is:

Kaiser Colosseum
Continuous Spell
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.

However, it doesn't destroy any monsters like Pineapple Blast does, it merely prevents your opponent from summoning/setting.