Kefka, Court Mage / Kefka, Ruler of Ruin Im biased
Its made for killing three players and you only need 20 to 30 mana towards the end of the game which is absolutely doable since you stockpile Treasures
First strike 3/3 Illustrated by Ben Wootten Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
Another one of my favorite examples, that is probably underappreciated outside of the Alpha context because its power is more subtle, are the Psychic Venom decks
You can't attack with them the same turn you play them, unless they have haste
Magics lore is set in a multiverse, a variety of worlds (called planes) with various civilizations, aesthetics, technologies, and forms of magic