Hogwarts: Pushing the Headmaster to the Max

Grade 1, Horace: "Headmaster, look, with my scythe I hook souls out, then lock them in this lamp and roast them with hellfire."

Grade 2, Horace: "Headmaster, look at this cabbage; it can endlessly appreciate in value and can instantly slay serpent monsters."

Grade 3, Horace: "Headmaster, look at this Soul Contract; can it arm a Dementor to become my Soul-Reaver Army?"

Grade 4, Horace: "Headmaster, look at this gravity magic: it can pull meteors from outer space down and grant top-tier strength to Durmstrang and Beauxbatons."

Grade 5, Horace: "Headmaster, you know if I project this sigil onto the Moon, anyone who sees it will be brainwashed into Fold-ear Root believers; the Fold-ear Root I planted in the Forbidden Forest will be a best-seller."

Grade 6, Horace: "Headmaster, behold: this seed grown into a tree can convert cosmic energy into magical seeds; then all of humanity can become wizards, with technology and magic in one hand; conquering the cosmos is just around the corner."

Grade 7, Horace: "Headmaster, you see..."

Dumbledore: "Don't say another word; draw out your wand; today it's either you die or I perish."

(Update irregular; author self-indulgent, comedic, multiple female leads.)