Creatures are permanents that can attack opponents and planeswalkers, block opposing creatures, and use their printed abilities. Creature cards normally have power and toughness, with power determining how much combat damage they deal and toughness determining how much damage they can survive.
Magic history is packed with memorable creatures far beyond combat basics. Birds of Paradise became an iconic source of mana fixing, Hypnotic Specter terrorized early hands with random discard, and Tarmogoyf became famous for efficiently growing according to the card types found in graveyards.