Quote from Empathogen »
What you're talking about really only applies to Modern and Legacy.
There could easily be Standard environments where other card types could make up a similarly high percentage of a deck.
This is almost always true of Creatures, and it could easily be true of Artifacts, as well.
Enchantments, Instants, and Sorceries are a bit trickier, but still possible.
Planeswalkers are probably too "rare" for that to be worthwhile.
We could feasibly see 24+-creature or instant/sorcery decks, we have before. But they're extremely few and far between, and it makes the mechanic considerably swingier. I can't see them wanting to print 10+ cards in one set with Instant/sorcery "Explore"