Gatewatch is a term used in the Magic: The Gathering trading card game, referring to a specific type of gameplay mechanic. It allows players to summon powerful creatures known as planeswalkers to assist them in battles. These planeswalkers can be used strategically to gain advantages over opponents. In the context of the game, gatewatch refers to a group of planeswalkers who work together to protect the multiverse from various threats. This group includes notable characters like Jace Beleren, Chandra Nalaar, and Gideon Jura, each bringing unique abilities and strengths to the team.