upperdeck.com Game Rules: Void any number of cards with "berry" in their name from your inventory. Target Neopet's Attack becomes 4, Defence becomes 3, and Agility becomes 4 this turn. Then for each "berry" voided by this card's effect, increase or decrease any of these stats by 1.
upperdeck.com Updates/FAQ: The controller of this card must choose to void additional cards as the first action of its effect and before taking any other actions on the card. The Neopet targeted by this effect still applies any changes to their stats from Equipment or other effects, including those created by this card.
Other official rulings and speculation:
Upperdeck.com link: https://my.upperdeck.com/public/neopets/cards/810
Wayback Machine link: (Updated: 0/0/20XX)