So discarding a split card counts as discarding a single card, and a split card in your graveyard counts as a single card with the types of both halves(for the purposes of something like Delve)
Contains art cards, not gameplay
A good example is the Dominarian lands from the Time Spiral block (Time Spiral, Planar Chaos, and Future Sight): Flagstones of Trokair, Academy Ruins, Kher Keep and Pendelhaven were all introduced in Time Spiral, before Planar Chaos completed the cycle with Urborg, Tomb of Yawgmoth
The ideal time to use Meloetta is when you have something big to use next, or if youve used a powerful Pokemon in the turn before and need to finish off what you started
It is often found in mountainous regions, staying true to its wild and untamed nature
There are other examples of classifications that are a little more niche, like ACE SPEC cards, Black Star Promos, and SSR cards