Maybe it was Jaguar?
RD/KP10-JP039 尖頭狩猟ディグモール Headhunters Digmole
Level 4 EARTH Beast-Warrior Effect Monster
[REQUIREMENT] If you have 10 or more monsters in your GY, you can activate this by shuffling 3 Beast-Warriors from your GY back into the Deck.
[EFFECT] Choose 1 face-up monster on your opponent’s field, it loses 800 ATK until the end of the turn.