Silver Myrramp$0.41A 2-mana mana creature that taps for colorless immediately and can fix into a color with an additional mana investment in some shells. It fills a very similar early-game utility ramp role.
Merfolk Looterutility$0.55A cheap blue creature with repeated tap-based utility that helps smooth draws and improves early setup. It shares the same color and low-cost creature slot, though it focuses on card selection instead of mana.
Apprentice Wizardramp$0.22A blue 2-drop that can generate colorless mana via tapping, closely matching the 'small wizard that produces mana' role. It is a direct functional cousin for blue creature-based acceleration.
Walking Atlasramp$1.31A low-cost utility creature that converts a tap into resource advantage by enabling mana development. It is slower and less direct than Sea Scryer, but occupies a similar early utility/ramp niche.
Llanowar Visionaryramp$0.18A budget-friendly creature that advances mana and replaces itself, serving the same kind of early board-development function. It is more expensive and in a different color, but comparable as a value ramp creature.
Izzet Chronarchutility$0.14Not a mana dork, but a blue creature that provides repeatable value through a body and spell interaction, similar in being a utility creature in blue. It is more of a late-game equivalent than a strict match.
Vedalken Engineerramp$0.44A creature that taps for mana and supports artifact-heavy acceleration, resembling Sea Scryer’s role as a low-cost mana helper. It is color-restricted, but still a comparable blue utility ramp piece.
Manalithramp$0.88A simple budget ramp piece that fixes mana in a similarly straightforward way to Sea Scryer's activation-based mana production. It isn't a creature, but it serves the same early mana development role.