Khalni Heart Expedition

Two-mana ramp with a delay clock attached: it asks you to play three lands after it resolves before it pays out two more from your deck, putting you up a card and a land in the bargain. That deferral inverts the usual green ramp arithmetic. Rampant Growth and Cultivate spend their mana the turn you cast them; this front-loads a cheap enchantment and back-loads the actual fixing, so the tempo cost is real but the eventual return (two basics for what amounts to two mana up front) is steep. The landfall trigger is permissive rather than mandatory, so the quest counters do not advance on their own; the card sits dormant until you string together enough land drops, and decks that flood the board with lands fast (fetches, additional-land-drop effects, anything that doubles your drops) collapse the timeline dramatically. The payoff scales with a deck already committed to hitting land drops every turn, converting that habit into explosive mana the turn it cashes out. The sacrifice clause leaves no lingering value engine behind: once the counters come off, it is gone, having done its one big job. A patient acceleration piece for builds that want the burst without spending mana on the turn they most need it elsewhere.