Combat Professor - Looks like a white Phantom Monster. Combat Professor is slightly worse at blocking, but better at attacking because you can choose where to apply the buff. I'm not sure if it's really what most people's white sections want, but still seems fine. You get the buff the turn you play it as well.
Eager First-Year - A playable 2 mana value play for the Boros decks, but is outclassed by most good 2 mana value creatures.
Bury in Books - 3 mana is on the expensive side, though 2 mana would be busted. Bricking a draw is fine which means that this can be compared to Temporal Spring. Though being mono-coloured and an instant help set it apart. I think that Bury in Books requires testing because it seems pretty decent in the right deck.
Frost Trickster is good. The only auto-include other than the lands in the set.
Resculpt. There are simply not enough treasure or clue tokens about to Resculpt. Turning a 1/1 into a surprise 4/4 looks like the best use case. Resculpt in response to creature removal is an ok use case. Shrinking opponents threats doesn't seem that likely to be worth it since most creatures aren't that much more threatening than a vanilla 4/4 and you could just play some hard removal in Resulpt's place.
Arrogant Poet - It attacks well. The life loss is steep, but notably optional. 2/1 means this has a weakness to Desert, unlike Fledgling Djinn. Arrogant Poet is certainly cubeable but doesn't stand out in any particular way.
Essence Infusion - Sort of a cheap Mark of the Vampire. Essence Infusion suffers from the same weaknesses as most auras but doesn't have the advantage of Mark of the Vampire of being extremely problematic when it sticks. Still, I could see Essence Infusion being playable in aggro match ups due to the life gain.
Lash of Malice - Comparable to Disfigure, the key difference being you can't shrink a creature in combat and expect your creature to survive as well, and you can pump an attacker in a pinch. Whether you prefer Lash of Malice to Dead Weight and Fungal Infection is up to personal preference. Lash of Malice is easily cubeable, though it is behind the premium Defile in terms of efficiency.
Leech Fanatic - Boot Nipper is just better. Though lifelink attackers are useful in races. The body is nothing special, but shores up the Dersert weakness. Boarderline cubable.
Mage Hunters' Onslaught - Could actually see this being the sleeper of the set. I prefer this to Bake into a Pie and Befoul as far as four mana options go. Then again maybe ye olde Eyeblight's Ending or Expunge is better in terms of efficiency. The life lost is only really relevant went you are the beatdown. Boarderline cubable.
Promising Duskmage - There aren't enough +1/+1 counter matters cards to synergise with this. And a vanilla 2/3 is very underwhelming.
Springmane Cervin - Better than Trufflesnout in most cases, though it might just be lacking 1 toughness from seeing play. (Most creature are to be fair.)
Elemental Masterpiece - Sort of a non-green Maul Splicer. Though since it's not green you probably can't afford it most games. Still signets exist so I wouldn't completely count this card out.
Lorehold Pledgemage - Playable, though not on the weaker end of 3 mana value creatures.
Make Your Mark - Sort of playable as a hybrid card. There is a functional reprint in red.
Moldering Karok Yeah, lifelink is a good mechanic in cube because aggro decks can't ignore it. So this card is playable.
Prismari Pledgemage - I prefer Skyclave Squid in it's place since red doesn't use the blocker and it's much easier to get the squid to attack.
Quandrix Pledgemage - Ok as a blue Spellgorger Weird. The double hydrid mana is actually a bit rough to cast because green has so few instants and sorceries.
Relic Sloth - Good combination of keywords and stats, unfortunately it is in Boros.
Silverquill Pledgemage - One toughness is rough. Flying and lifelink are both good key words though.
Spectacle Mage - Strong abilities, unfortunately most 5 mana value or greater instants and sorceries are bad.
Stonebound Mentor 3/3 for 3. Unfortunately the rules text is rarely relevant, which is doubly bad for being a gold card.
Teach by Example - Interesting, but ultimately not going to do much.
Eager First-Year - A playable 2 mana value play for the Boros decks, but is outclassed by most good 2 mana value creatures.
Bury in Books - 3 mana is on the expensive side, though 2 mana would be busted. Bricking a draw is fine which means that this can be compared to Temporal Spring. Though being mono-coloured and an instant help set it apart. I think that Bury in Books requires testing because it seems pretty decent in the right deck.
Frost Trickster is good. The only auto-include other than the lands in the set.
Reject. Ehhh, playable. Sort of a mix of Mana Leak, Essence Scatter and Syncopate, but worse than them all.
Resculpt. There are simply not enough treasure or clue tokens about to Resculpt. Turning a 1/1 into a surprise 4/4 looks like the best use case. Resculpt in response to creature removal is an ok use case. Shrinking opponents threats doesn't seem that likely to be worth it since most creatures aren't that much more threatening than a vanilla 4/4 and you could just play some hard removal in Resulpt's place.
Waterfall Aerialist - This is the first ward creature. Still, it's worse than Illusionary Forces, Augury Raven and Shimmering Glasskite which is Waterfall Aerialist's competition for it's card slot. Heck, even Aven Fleetwing might be better.
Arrogant Poet - It attacks well. The life loss is steep, but notably optional. 2/1 means this has a weakness to Desert, unlike Fledgling Djinn. Arrogant Poet is certainly cubeable but doesn't stand out in any particular way.
Essence Infusion - Sort of a cheap Mark of the Vampire. Essence Infusion suffers from the same weaknesses as most auras but doesn't have the advantage of Mark of the Vampire of being extremely problematic when it sticks. Still, I could see Essence Infusion being playable in aggro match ups due to the life gain.
Lash of Malice - Comparable to Disfigure, the key difference being you can't shrink a creature in combat and expect your creature to survive as well, and you can pump an attacker in a pinch. Whether you prefer Lash of Malice to Dead Weight and Fungal Infection is up to personal preference. Lash of Malice is easily cubeable, though it is behind the premium Defile in terms of efficiency.
Leech Fanatic - Boot Nipper is just better. Though lifelink attackers are useful in races. The body is nothing special, but shores up the Dersert weakness. Boarderline cubable.
Mage Hunters' Onslaught - Could actually see this being the sleeper of the set. I prefer this to Bake into a Pie and Befoul as far as four mana options go. Then again maybe ye olde Eyeblight's Ending or Expunge is better in terms of efficiency. The life lost is only really relevant went you are the beatdown. Boarderline cubable.
Promising Duskmage - There aren't enough +1/+1 counter matters cards to synergise with this. And a vanilla 2/3 is very underwhelming.
Blood Age General - Again, there isn't support for this outside of Triplicate Spirits.
Fuming Effigy - Summit Prowler with upside. Flashback cards are played in red, but overall it's going to be a vanilla creature.
Grinning Ignus - This guy again. There isn't much to do with the mana in pauper. And vanilla creature body is very underwhelming.
Heated Debate - Fine, not that the counter clause is going to come up much. Demon Bolt is better.
Pigment Storm - Yeah, going to be worse than Searing Barrage nine times out of ten. And Searing Barrage isn't really played.
Pillardrop Warden - Notable for being a good reacher, though red mostly wants to attack.
Bayou Groff - You can Unearth this. That's about it.
Mage Duel - Could be fine alongside Ponder. I think is is playable.
Reckless Amplimancer - Can get buff. Still not going to out compete Green's existing 2 mana value creatures. Especially not Darkthicket Wolf.
Scurrid Colony - Eight lands is not realistic.
Springmane Cervin - Better than Trufflesnout in most cases, though it might just be lacking 1 toughness from seeing play. (Most creature are to be fair.)
Tangletrap - A better Plummet.
Blood Researcher - It's got potentual.
Elemental Masterpiece - Sort of a non-green Maul Splicer. Though since it's not green you probably can't afford it most games. Still signets exist so I wouldn't completely count this card out.
Infuse with Vitality - Fine but not outcompeting Putrid Leech and Consume Strength.
Lorehold Pledgemage - Playable, though not on the weaker end of 3 mana value creatures.
Make Your Mark - Sort of playable as a hybrid card. There is a functional reprint in red.
Moldering Karok Yeah, lifelink is a good mechanic in cube because aggro decks can't ignore it. So this card is playable.
Prismari Pledgemage - I prefer Skyclave Squid in it's place since red doesn't use the blocker and it's much easier to get the squid to attack.
Quandrix Pledgemage - Ok as a blue Spellgorger Weird. The double hydrid mana is actually a bit rough to cast because green has so few instants and sorceries.
Relic Sloth - Good combination of keywords and stats, unfortunately it is in Boros.
Silverquill Pledgemage - One toughness is rough. Flying and lifelink are both good key words though.
Spectacle Mage - Strong abilities, unfortunately most 5 mana value or greater instants and sorceries are bad.
Stonebound Mentor 3/3 for 3. Unfortunately the rules text is rarely relevant, which is doubly bad for being a gold card.
Teach by Example - Interesting, but ultimately not going to do much.
Thrilling Discovery - Boros Cathartic Reunion with upside. Seems cubeable.
Witherbloom Pledgemage - A 5/5 for 5 in black (or I guess green). Mostly isn't going to do enough, but still will be playable in a pinch.
Excavated Wall - Strictly better Steel Wall.
Lorehold Campus, Prismari Campus, Quandrix Campus, Silverquill Campus, and Witherbloom Campus - All of these are the best of their card slot and are staples. A mana fixing land that can scry as a mana sink is very good. Much better than the gain 1 life varieties. Also the lack of Ally symmetry doesn't bother me.
I'm not considering any of the learn cards and lessons since there are no good combinations other than the pest one.