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 Unlimited - $4.70
NM-Mint Unlimited Non English - $4.70
Lightly Played Unlimited - $4.50
Lightly Played Unlimited Non English - $4.50
Moderately Played Unlimited - $4.30
Moderately Played Unlimited Non English - $4.30
Heavily Played Unlimited - $3.80
Heavily Played Unlimited Non English - $3.80
Damaged Unlimited - $3.10
Damaged Unlimited Non English - $3.10
NM-Mint 1st Edition - $4.70
NM-Mint 1st Edition Non English - $4.70
Lightly Played 1st Edition - $4.40
Lightly Played 1st Edition Non English - $4.40
Moderately Played 1st Edition - $4.20
Moderately Played 1st Edition Non English - $4.20
Heavily Played 1st Edition - $3.70
Heavily Played 1st Edition Non English - $3.70
Damaged 1st Edition - $3.10
Damaged 1st Edition Non English - $3.10