When an effect resolves that was activated by your opponent's Effect Monster on the field, they can discard 1 card. If they do not, that effect is negated.
NM-Mint Limited - $10.30
NM-Mint Limited Non English - $10.30
Lightly Played Limited - $9.80
Lightly Played Limited Non English - $9.80
Moderately Played Limited - $9.30
Moderately Played Limited Non English - $9.30
Heavily Played Limited - $8.30
Heavily Played Limited Non English - $8.30
Damaged Limited - $6.70
Damaged Limited Non English - $6.70