A Planeswalker is a powerful character in the trading card game Magic: The Gathering. They possess the unique ability to travel between different planes of existence, each with its own distinct environments and creatures. Planeswalkers are often depicted as powerful mages who can summon spells and creatures to aid them in battles against other players. In the game, players can use Planeswalker cards to represent these characters. Each Planeswalker card has its own abilities and loyalty points, which can be increased or decreased during gameplay. Players must strategize to effectively use their Planeswalkers to gain an advantage over their opponents.