With Mewtwo EX being such a popular card, Koga decks are definitely worth considering
Illustrated by Adam Paquette Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
Nashi, Moon Sages Scion Nashi, Moon Sage's Scion is another mono-black rat ninja like Ink-Eyes, Servant of Oni, but it has a ninjutsu ability that costs 1 mana less and a more valuable combat damage trigger that affects all players rather than just one opponent
Basically, if it has any of those set marks, is copyright 1995, and has a white border, then its from Chronicles
Some other cards that fit into this category, but will probably be worth less money, are Zacian V, Zamazenta V, Hisuian Samurott V, Hisuian Goodra, Latias, Darkrai VSTAR, Diancie, and Thievul - all of which are Secret Rares