The reward for winning is a new location on the map (in the bottom-right), which consists of a room in which you can talk to (and duel) Yami, Pegasus, Seto, Shadi, Simon Muran, Bakura (!), Noa (!!) and the Marik-controlled version of Jounouchi (from Battle City)
Activate 1 of the following effects, based on this card's ATK/DEF on the field: *If ATK is higher than DEF: Special Summon 1 "Otherworld Beast Deoxys - Attack Mode" from your hand, Deck or GY
I like the recent ones from 151 and the older ones pictured here
Lycanrocs attack, Clamping Fangs, deals 40 plus 40 more for each damage counter on the opponents Active Pokemon
Either way, in a dedicated food or squirrels deck its pretty decent, especially if you exile your own mana dork
All creatures will die upon the resolution of this card, and your foes dont even get the chance to regenerate them