Mystic Sanctuary - Throne of Eldraine (Common) [ELD-247]

Mystic Sanctuary, from the Throne of Eldraine set, is a land that taps for blue mana but enters the battlefield tapped unless you control three or more other Islands. When it enters untapped, you can return an instant or sorcery from your graveyard to the top of your library, making it a valuable tool for spell-heavy strategies. It works well in control or combo decks that rely on recurring spells, though its reliance on having multiple Islands can be a limiting factor.