I can't take credit for this one because "Girl Genius: The Works" actually uses it, but I think there should be more TCGs where keywording is based on whether the word in question appears anywhere on the card, even in the rules or flavour text. I'd love to see a "serious" TGC run with that idea.
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...and then they accidentally also support the entire Speedroid archetype. And also Dark Jeroid and Elemental HERO Necroid Shaman.
Cards that scale based on playing other cards with the color purple anywhere on them
The second TCG tournament adds a rule that says you can’t draw on your cards