Knights of Dol Amroth, Thunder Drake: maybe okay just as a conditional counter producer
Gitaxian Raptor: its counters are probably comparable to stun counters, which is a very minor (probably not enough to be considered much when drafting) proliferate reward
Fae Flight: permanent flying and power buff probably makes this more of a consideration for tempo decks
Sort of abandoning vampire theme and not pushing giant theme as hard (higher bar of cross-theme synergy or excitement for giants to be included). A little sparse on both rewards and bodies. Threshold 1 (often counting itself) feels like a relevant metric.
Etali's Favor: more tempo-oriented?
Ancestors' Aid: card draw (clue) is better reward than mana (treasure), just like how mana discount is not that valuable of a reward. Recurring treasure creation might be more valuable though.
Stinkdrinker Daredevil: mana discount is not as appealing of a reward (no extra value, only tempo). Also does not count itself for threshold 1 metric
Joraga Auxiliary: okay but mana sink feels prohibitively expensive and the body is not interesting otherwise
Mirari's Wake: uninterestingly strong
Selvala, Explorer Returned: sort of not thematic and a bit generically strong, but also not in an especially interesting way. Can lead to some interesting mana acceleration, but it's been a little overplayed and I'm not excited by it anymore. Extreme mana acceleration is not especially interesting in GW which is already a relatively strong and safe color pair.
Conclave Cavalier: might be excessively hard to cast and not super thematic, but getting it onto the board feels exciting. The vigilance in theory makes it feel like a huge pressuring obstacle.
Magister of Worth: a bit awkward and not thematic in this cube
Motify, Putrefy: okay but generic
Winged Coatl: at its most exciting, basically a combat kill spell with extra steps, which is not super exciting. Not super thematic either
Frilled Mystic: feels more inherently exciting, but also has more tension in playing correctly (unlike Winged Coatl which can always be played for efficiency even if no opportunity arises to take advantage of it)
Kiora, Behemoth Beckoner: Actually not very thematic nor reasonably strong and cheap hybrid makes it not function as well as a multi-color card. The latter is not a deal breaker, especially for stronger color pairs like UG, but it is not interesting enough
Serum-Core Chimera: might be okay but essentially threshold 3, which might be prohibitively large
Saheeli, Sublime Artificer: Feels very hard to get to work at a comparable strength. Might essentially be threshold 2 or more, and is more vulnerable than a creature.
Third Path Iconoclast: might be okay but a bit split on its themes and a 1/1 might not be super impressive for spell tempo theme. Helps that its body is reasonable and cheap though.