I don’t think this can work in all games, but I like cards that have dual uses, or the use can vary depending on the situation.
In the Star Wars LCG for example, later on in the lifecycle of the game, they introduced a new kind of card called “Pilots.” Instead of just being unit cards like an X-Wing, or individual hero cards like Luke Skywalker, Pilot cards were kind of a mixture of both. You had pilots like Wedge Antilles, who you could play as a unit/hero, and he’d be ok, but if you attached him to an X-Wing, he became super powerful. Pilots allowed Star Wars to introduce new cards, but they combo-ed with old cards, so players wanted those in their decks as well.
Another example both from the Star Wars LCG and Destiny is Darth Vader’s lightsaber. Any Sith force user can use Darth Vader’s lightsaber, but when you attached it to Vader specifically, he became a beast.
If possible, I think more games should try to introduce multi-use or multi-role cards like these.