When there is 1 or more monster on the field of the controller of this card, his/her opponent cannot place a monster on the field if the opponent would then have more monsters on the field than the controller of this card.
Near Mint Unlimited - $5.30
Lightly Played Unlimited - $4.80
Moderately Played Unlimited - $4.30
Heavily Played Unlimited - $3.80
Damaged Unlimited - $2.70