Turntimber Grove

A green mana source that pins a one-time +1/+1 onto a creature as it arrives, stapling half a combat trick onto a land that taps for every turn after. The pump is trivial in isolation, a single point of each stat with no recurrence, but the design assumes a board where bodies are cheap and individually fragile. Lands can only be deployed during your main phase, and the buff fades at cleanup, so the toughness does nothing against a sweeper on the opponent's turn; it earns its keep in combat, or in surviving instant-speed interaction while you hold priority. An extra point of toughness keeps a one-drop above a ping; an extra point of power shoves a creature past a blocker or into lethal, and it does this for free on top of the mana. The entering-tapped clause is the entire cost: it cedes a tempo beat for a manabase that occasionally swings a combat. That tradeoff anchors a green cycle of taplands that bartered a turn of speed for small, color-aligned upside; what sets this one apart is that the upside is combat-relevant rather than incidental, tying its value to whether you have a creature worth pumping the turn it lands. Drop it on an empty board for a sluggish Forest with a wasted trigger; play it pre-combat on a turn you already mean to attack and it functions as that bolted-on trick. The whole ask is sequencing: you have to time when this land hits the way you time a spell.