Decks that want to draw cards with Fact or Fiction are very unlikely to also be able to optimally use a Skullclamp, decks that have the mana to bust out a five or more mana draw spell are similarly unlikely to also want to use the economic but slow Ancestral Visions
"Pikachu, who calls himself a great detective, speaks repulsively in human language
Electabuzzs HP has increased only 50% from its lowest 60 to 90, while Hitmonchans has increased by 100% from 60 to 120
Necromancer's stumble ability makes it a lot safer to normal summon it, with an attack of 0 and no more, being automatically swapped to defence mode is an effect that only banes Infernity Barrier but it makes up for it by special summoning a new monster in attack mode if desired
At least Nightmare Moon has friends with Syr Cadian, Knight Owl, and Old-Fashioned Vampire
Some quick-thinking players discovered loopholes involving some pretty crazy combos, allowing moves that would quickly break or ruin the game - we are looking at you Last Turn