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.Emeria, the Sky Ruin turns a Plains-heavy mana base into a recurring creature recovery engine. It enters tapped and produces white mana, then returns a creature from your graveyard during your upkeep if you control at least seven Plains. Reaching that threshold takes time, but repeated recovery from a land slot can give a white deck substantial staying power in longer games.
Sun Titan is a strong partner because it can return smaller permanents while Emeria returns larger creatures. Solemn Simulacrum helps build the land count and provides value when it returns, making it a useful creature to cycle through combat or sacrifice effects. Decks that already want a high basic Plains count can pursue the engine without heavily distorting their mana base.
The condition counts lands with the Plains subtype, not only basic lands named Plains. Typed dual lands can help in multicolor decks, while Emeria itself does not normally count because it lacks that subtype. Land-search effects that find Plains can improve consistency, but they still need to support the deck's early mana requirements rather than only the late-game threshold.
The seven-Plains condition is checked when the upkeep ability would trigger and again when it resolves. Losing enough Plains during that window can stop the return. Include Emeria when a tapped land is an acceptable early cost and your games regularly last long enough for a repeatable reanimation ability to become a meaningful source of advantage.
