Eureka Moment

Growth Spiral, one card up. The comparison is deliberate and it explains almost everything about how this plays: where the two-mana instant draws one and drops a land at a rate cheap enough to see constructed play, this pays two more mana to double the draw. That extra card is the entire pitch, and it lands the effect squarely in a different economic tier. The land drop stays optional and stays a bonus rather than a requirement, so a hand with no extra land simply cashes in the two cards and moves on, which keeps the card from being dead in the late game the way pure ramp spells become. The design logic is a value-over-tempo instant: it does not accelerate you onto a bomb the way a two-mana version might, because by the time you have four mana up the ramp matters less than the raw card advantage. What it offers instead is the flexibility of holding it at instant speed, refilling on an opponent's end step while banking a land drop you can deploy without exposing it to sorcery-speed disruption. It is the Simic color pair doing exactly what that pairing has always done: convert mana into cards and cards into more mana, patiently, at a rate that asks whether the extra draw was worth the extra two.