READING THE FINE PRINT So, to recap: the way to get these cards is going to be simply opening boosters of The Brothers War (Set, Collectors or Bundle but not Draft, since they obviously arent part of the Limited format)
Ponder lets you look at the top three cards of your library, rearrange them if you like, and then decide if you want to shuffle, after which you draw a card
Darkness Cards: Darkness / Monster A Deck Order: Start 0/0 (1) You can target 1 monster you control
This theme is led by Ogdoabyss, the Ogdoadic Overlord , which can send all monsters on the field to the GY, except those Special Summoned from the GYs
Palkia 80 Rhyhorn Fighting 80 Horn Attack (40) Palkia 81 Rhydon Fighting 110 Wrack Down (70) Palkia 82 Rhyperior Fighting 160 Mountain Swing (150) Discard the top 3 cards of your deck
Maybe you got some online marketplace with prices that seemed way too high, or way too low