Well that’s an oddly quirky effect.
RD/KP03-JP036 ルミナス・パロット Luminous Parrot
Level 4 LIGHT Winged Beast Effect Monster
Requirement: If there are 2 or more face-up monsters on your opponent’s field, you can send the top card of your Deck to the Graveyard.
Effect: Choose 1 face-up monster on the opponent’s field. During that turn, that monster’s Attribute is LIGHT.