My idea of Card Slash is basically Pokemon TM, but both for Stat/Condition Modifiers (like, White Wings is not an actual attack, it's just a boost/ability), and of course for actual Exclusive Attacks (like we can see in Tamers with Leomon using LadyDevimon's attack, and so on). The latter is different from absorbing attacks precisely in being one-time use (per battle or something) and activated as an Item, not as an Attack. They way I see the major difference would be that you BUY (or RECEIVE) Cards from either the Shop or from NPCs or from the relevant defeated Digimon, as a loot. Data Loading, though, means that you sacrifice a Digimon you OWN, not DEFEAT (yes, not how it works in Tamers, so you can choose either way, whichever you like more). It's not a huge difference, but it is a separate mechanic, in case you actually go through with both. OR you can just make ALL of it Loot that falls from relevant Digimon, and not make it overly complicated. I do hope you actually DO it one day, lol.