Legends introduced MTG cards representing specific characters, while expansions like Antiquities and Fallen Empires featured mechanical themes and an actual story
Chaotic by name and chaotic by nature, in Spiral Chaos you'll find frogs with every ability under the sun, foot tokens, and expensive artifacts that let you pay nine mana to simply "choose a number"
This means that whenever you cast a Human, you receive two Humans instead, functioning quite well with kindred-based cards that are more effective with large quantities of creatures
Sure, Wizards might have allowed Hypnotic Specter for a while (it was eventually banned) and banned Serendib Efreet, but I'm not bitter
Released in the 2002 MTG set Odyssey, Soulcatcher's Aerie is a pretty simple enchantment card that provides a massive buff to bird decks
Many of these interactions allow you to win the game outright, changing the game to one of racing towards a combo, or denying the opponent the same