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.Sunpetal Grove supports green-white decks by supplying either color from one land. It enters untapped when you already control a Forest or a Plains, so its performance depends on the types represented by your earlier land drops. A basic or a typed nonbasic can satisfy that requirement. This makes it particularly useful after the first turn, when the mana base has begun to establish itself.
Temple Garden is a useful partner because its basic land types can enable the untapped entry. Windswept Heath can find that shock land or an appropriate basic first, setting up a later Sunpetal Grove. Sequencing those sources in the right order can preserve mana for development and interaction without paying life for this land itself.
For token and enchantment strategies, the practical benefit is choosing between spells such as Three Visits and Swords to Plowshares as the turn develops. Green ramp can establish the mana needed for token producers while white supplies protection and removal. Avenger of Zendikar and Anointed Procession illustrate the value of keeping both halves of the deck available as the game develops. A flexible source supports those decisions without requiring a separate fixing artifact to stay on the battlefield.
The entry check uses land types rather than names or the colors a land happens to produce. Sunpetal Grove has no basic land types of its own, so a fetch land cannot search for it. An opening hand built only from lands with similar conditions may start slowly. Keep enough reliable first-turn sources to make the condition easy to meet.
