Strong/Staples:

None.

Interest:

Gloryheath Lynx (U): In the same category as Phyrexian Missionary, Sun-Blessed Healer, Brightblade Stoat, or Prairie Dog, but I really like Lynx’s upside because it curves naturally in an aggressive or midrange deck into “drawing” a plains on turn 3 when you play a creature.

Sundial, Dawn Tyrant (U): It’s not interesting, but it’s probably playable and I don’t think we’ve had this much beef at 2-mana in White before.

Similar:

Lightshield Parry (C): Probably better than Will of the All-Hunter as 1-mana >>> 2-mana. But I’m not sure what deck wants a combat trick and isn’t already losing if it needs to cycle it to look for a different threat/answer.

Tune Up (U): Incredibly minor upgrade over Refurbish.

Unique/Synergy:

Guidelight Synergist (U): A mono-White (slightly worse) Cephalopod Sentry. If you can reliably get two other artifacts, it’s worth considering as a 3/4 flyer for 4-mana, but that likely requires a dedicated White artifact deck.

No Interest:

Air Response Unit (U): A 3-mana vehicle that functionally grants a creature flying and +1/+0 or +2/+0. We already had the very similar Dragonfly Suit and that wasn’t close to playable. Vigilance is better since it can also block, but that requires yet another creature (spending three cards to get a single vigilant threat is not playable).

Alacrian Armory (U): Unless you can utilize the mounts/vehicles clause, this is likely to be worse than Hold the Gates.

Brightfield Glider (C): The non-saddled mode isn’t playable and the saddled mode is only useful in a board stall since it net loses you power.

Brightfield Mustang (C): I think Guardian of the Forgotten will play better in most instances since it doesn’t require a second creature (even if it can’t continue to grow).

Broadcast Rambler (C): White 5-mana plays are a very tight section and this is functionally a 5/4 that dies into a 1/1 flyer. Not enough compared to Cloudgoat Ranger or Githzerai Monk.

Canyon Vaulter (U): The floor isn’t playable, but isn’t too far below, but the upside is going to be fairly negligible in most cubes.

Cloudspire Captain (U): The base body is too vanilla and too far below-rate and the anthem effect is too narrow.

Collision Course (C): I like Thraben Charm better unless you desperately need White artifact removal. And even then it’s sorcery speed.

Daring Mechanic (C): Too limited an ability in the vast majority of cubes and a vanilla 3/3 for 3-mana isn’t playable.

Detention Chariot (U): I’d prefer Alabaster Host Intercessor or Cast Out.

Gallant Strike (U): MIscalculation works because the cycling mode allows you to trade in the card when the tax effect is no longer effective. Here, the conditional removal is more likely to be effective later in the game, so the cycling option should be an early-game play, but I don’t want to cycle away removal often (one of the cons of Cast Out) unless I absolutely need to. This is cheaper than Radiant’s Judgment, but I think it runs into the same problems.

Interface Ace (C): You are unlikely to play vehicles with high crew costs already and being able to crew 2 of them (or block after crewing) feels limited in relevance; playing a mostly-vanilla 0/4 does not excite me when I could play Wall of Omens.

Leonin Surveyor (C): Regardless of my thoughts on speed as a mechanic, I think this just doesn’t do enough when we have Brightblade Stoat and Sunhome Stalwart.

Lightwheel Enhancements (C): Very similar to Sentinel’s Eyes, which I prefer as it avoids unnecessary additional mechanics. But I prefer Gryff’s Boon to both.

Lotusguard Disciple (C): Not having flash will most often make this ETB effect simply gain some life (or push through a little damage). I think you’ll do better with Aven Riftwatcher, Angel of Vitality, or Holy Cow.

Nesting Bot (U): I dislike the Speed mechanic, but even if you’re okay with it, you’ll probably be better off with Indebted Spirit unless you really want artifact creature synergies.

Pride of the Road (U): I think it’s easier to trigger Duelcraft Trainer.

Ride’s End (C): A slight upgrade over Luminous Rebuke.

Roadside Assistance (U): Sidegrade of Squire’s Devotion. Almost certainly worse than Sheltered by Ghosts.

Spotcycle Scouter (C): The vehicle isn’t worth enough to justify spending a card on it even if it scrys 2.

Swiftwing Assailant (C): Too slow to become a mini-Serra Angel when we already have Aerie Auxiliary.

Unswerving Sloth (U): It’s got indestructible and vigilance if you have a large enough board. But 5-mana White creatures are fairly competitive and this just feels “fine.” Not sure it’s better than Serra Angel.

Voyager Quickwelder (C): Most White artifact decks are aggressive and this is more controlling in stat line. I think you’ll be better off in most decks (even in equipment decks), with Eowyn, Lady of Rohan. Even in an artifact deck, I think you’d prefer Foundry Inspector.