While the promo cards are the main part of the new Pokmon TCG product, there is more content
Card Set(s) -THE TIME OF BATTLE- [OP-16] CARD VIEW OP16-078 | UC | STAGE Marineford Block icon 5 Effect [On Play] Look at 5 cards from the top of your deck
Cards with multiple card types are at a premium, so the deck is full of stuff like: Solemn SimulacrumSolemn Simulacrum Dryad ArborDryad Arbor Demonic CovenantDemonic Covenant Theres plenty of self-mill to fill your graveyard: Deadbridge ChantDeadbridge Chant Nyx WeaverNyx Weaver Crawling SensationCrawling Sensation You also have a couple ways to get those cards back, like ReanimateReanimate and Whip of ErebosWhip of Erebos
The former could hit cards like Birthing Pod, Cryptic Command and Splinter Twin all of which were important, but the latter was better versus Burn and Zoo, and also back then manabases were a lot more painful as decks were more reliant on Shocklands, which meant a turn one Thoughtseize commonly saw you at 15 life from the get-go
Its honestly kinda neat that this card has been so good for so long, through so many formats