User blog comment:Memphis the light/Duelists invite/@comment-1478167-20110901205259/@comment-1272757-20110901211700

Varies depending on the archetype and strategy. For a generic deck at 40 cards, 20 Monster, 10 Spell, 10 Trap. That's the ratio Memph told me once. Though like I said, that probably varies depending on the deck and strategy you're using.