Double Explore Scout
Topography Tracker is a compact engine that rewards boards built around creatures and incremental advantage. Casting this {2}{G} two two gives you an immediate Map token and a passive rule that doubles every explore trigger your creatures would get. In practice the card turns a single explore into two, letting you dig for lands and effects faster while applying pressure with the creature itself.
Use the Map token as a one use backup that can trigger an additional explore when you need it. The Tracker fits cleanly into green shells that value on demand card flow and repeated triggers. From a lore standpoint the merfolk scout charts caverns and currents so you get a mechanical feel that matches the Lost Caverns of Ixalan setting without fuss.
Card Details:
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Mana Cost: {2}{G}
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Card Type: Creature
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Subtypes: Merfolk Scout
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Card Text / Rules Text (Printed): When Topography Tracker enters the battlefield, create a Map token. (It is an artifact with "1, T, Sacrifice this artifact: Target creature you control explores. Activate only as a sorcery.") If a creature you control would explore, instead it explores, then it explores again.
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Power / Toughness: 2/2