Mercadian Atlas

The clever bit is the condition: card advantage in exchange for skipping your land drop. That trade only looks free if you've stopped needing lands, which is exactly the late-game state where a five-mana colorless engine wants to start paying off. The Atlas throttles itself; the moment you draw and play that extra land, it goes quiet for the turn, so the deck most rewarded is one that has hit its mana sweet spot and would rather turn future draws into spells. That makes it a colorless gas pedal for any color combination, which is the whole reason an Artifact, Book reads as five generic mana and nothing more. The friction is real, though: passing on a land drop is a meaningful concession in any deck still developing, so the engine only earns its keep once the manabase is settled and the topdecks would otherwise be dead lands. This is patient, grindy advantage of the sort an artifact slot hosts well: no color requirement, no board presence, just a slow drip of cards for decks built to outlast rather than outrace. The trigger sits on your end step, so it never disrupts your own land sequencing within a turn; it simply asks, at the very end, whether you were willing to skip the drop.