(Or 40 in limited, or 100 in commander, or 80 if you're playing Yorion, etc.) Both studies of shuffling were talking about decks with all unique cards and no duplicates, which does not describe most Magic decks in any non-singleton format
Venom Blast is a Sorcery card in Magic: the Gathering MTG
Frogkin Kidnapper is the proto-version of Elite Spellbinder, giving playtest cards a prescient Future Sight vibe (not to mention Enchantmentize literally being a preview for One with the Stars)
The four-mana slot is when you get to a real turning point and you start to want to not have too many cards
For that to be the case, each card would somehow have to be able to look at the surrounding cards, see that they are the same type as itself, and move itself away from them
You may reveal a planeswalker card from among them and put it into your hand