The dice stickers include pictures of Supplies, Labor, Kopins, Groo, Rufferto, and pointing hands. In the comic books, any town Groo enters suffers some damage - it's just the poor soul's nature. While not malicious, he's very stupid and clumsy, and a jinx of the worst nature. Resources are required to bring certain cards out of your hand, shown on each card. You'll hear the other players gasp in admiration . . .
Most cards have a special effect listed at the bottom.
All troops which participated in the attack are then discarded. This simple mechanic allows you to whittle down someone near to victory, while preventing huge army buildups, the bane of certain other games. When Groo is between the two towns, Groo Effect cards can be played by either player, to affect your opponent. He stays in between towns until moved by a card or die result. Thus, on my turn, I can play Groo Effects cards on your town, and you can play them on my town during the Leftovers phase, providing there's enough Groo Heads for both of us.