3 of JubJub Engineer "You may tap this Neopet to draw 2 cards and then choose a card in your hand and discard it."
3 of Battle JubJub "You may tap this Neopet to attach an Equipment from your discard pile to one of your Neopets or Heroes."
3 of Blue or Gold Scorchstone "To play this, tap one of your Neopets. When this Neopet or Hero loses a contest on your opponent's turn, you may discard this Equipment. If you do, your opponent doesn't bank or draw a card for winning the contest."
3 of Rocket Boots "To play this, tap one of your Neopets. At the end of each of your turns, untap this Neopet or Hero."
Practically, you can't win if you go up against this. My "little friend" I play against is a rather clever young fellow who found out his love of JubJubs has proven unbeatable except by sheer luck and speed.
Oh, and don't bother with things that send the Scorchstones to the discard pile. He still gets each one back anyway.
Methinks I'll need to specialize SOMEHOW against him. Perhaps equipping MINE with Blue SSs (since he has the gold ones) will let me win due to decking.
In Magic, this would be known as a "cheese" combo, and "broken" if it's overused. Cards have been banned from tournament for this kind of thing.