The task itself is actually not that difficult, but it requires you to use much more brainpower than just about any card in the game and would also take quite a long time to activate because it requires you to work with several different numbers at a time and try to put them together in a way you wouldn't be expected to when you play a card game
It was not for sale in any theme decks, sets, or booster packs
Together they'd let you draw more than half your deck
1 Zekrom ex (Back White Rare) $359.99 Black 'Mon, Black Card, All Black Everything As expected, Zekrom claims the top spot as the most valuable card in the Japanese Black Bolt set with a unique Black White Rare
Booster Box (Dragon Ball Super Legend of the Dragon Balls | Dragon Ball Cards) prices are based on the historic sales
When I attack with a Digimon, can I activate its When Attacking effect twice in a single attack, giving an opponent's Digimon -4000 DP