This is due to the incredibly low volume of sales that have taken place
Lower Text - Promo Info BOOSTER CROSS ENCOUNTER [BT-10] CLOSECLOSE BT10-086 SR Digimon Lv.6 Parallel Rare Omnimon (X Antibody) Color White Form Mega Attribute Vaccine Type Holy Warrior/Royal Knight/X Antibody DP 16000 Cost 16 Digivolve Cost 1 7 from Lv.6 Digivolve Cost 2 7 from Lv.6 Upper Text Digivolve: 3 from [Omnimon]When a Digimon with [X Antibody] in its digivolution cards would digivolve into this card, reduce the digivolution cost by 2.[When Digivolving] Return all of your opponent's Digimon with the highest level to the bottom of their owners' decks in any order.[When Digivolving][When Attacking][Once Per Turn] By placing 1 [X Antibody] or level 6 card from this Digimon's digivolution cards at the bottom of its owner's deck, reveal all of your opponent's security cards, and trash 1 of them

The two overlap on some hefty card draw spells ([mtg_card]Incendiary Command[/mtg_card], for example), but you could also pull apart the precon and build distinctly different decks around each respective commander
Often the last step on each of them is that they transform into a creature card referencing those same cards
Ashnods Coupon Ashnod's Coupon lets you get a drink without getting up
The game explains this mechanic as follows: If the availability period for a given booster pack ends, its Pack Points will no longer be available for exchange. This makes it essential to spend all your points before a booster pack lineup expires