Delve has been printed on creatures, instants, and sorceries so far, and we could see it on other permanent types in the future, but Teval, Arbiter of Virtue gives it to all your spells
Exceptions: Apiary, Cobbler (but not Shoemaker), Wainwright
Promo 105/S-P - Swallowed-Up Pikachu Promo 124/S-P - Pikachu Promo 144/S-P - Kanazawa Pikachu Promo 208/S-P - Yu Nagaba Pikachu 111
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With no further Pokmon games announced, that leaves a full year between Pokmon TCG Pocket and the upcoming Pokmon Legends ZA, that is of course unless no new titles are announced to debut alongside the upcoming next-gen Switch 2
It appears here as a legendary land that enters the battlefield tapped, and produces black mana