Sunpetal Grove

The conditional tapland design exists to thread a needle that the original dual lands and their fetch-fed successors solved by brute force: enter untapped, but only when you have already committed to the colors it serves. The check is for basic land types, not the lands' actual mana, which is the structural cleverness here. Controlling a Forest or a Plains turns this on, so it rewards a manabase that shares its land types alongside it rather than a pile of lands that happen to make the right colors without carrying the type. That makes it tense with greedy four- and five-color builds and comfortable in disciplined two-color decks built around its pair. The tradeoff is a turn of tempo: cast it on an empty board and it costs you a tapped land, but in the back half of a curve, or once a single matching land type is down, the drawback evaporates entirely. It sits in a lineage of GW fixing that has rarely needed to be flashy, doing the quiet work of letting a deck cast its early plays on color without bleeding life the way a painland or a shockland does. No life loss, no graveyard interaction, no upside beyond fixing: the design is honest about being a role-player whose only job is to make the colors come out right at the moment they are needed.