Well, finding the remaining spoilers after my move was a nice surprise. As for likely inclusions...
Arrester's Zeal actually seems pretty interesting unless I am missing some crad which just plain gives the effect for the mana without the condition. Forbidding Spirit appears nice but basically just states 'next turn, target opponent must choose between playing on curve and attacking'. I would need to hear about results. Pteramander: Get in mah CUbe! Dagger Caster: A good amount of Goblin Chainwhirler for our format. But perhaps the worse stats just do not cut it. Light Up the Stage: Good CA in red. Smelt-Ward Ignus: Big maybe; it is still an interesting tradeoff to pull that trigger though the base creature could be better. Gruul Beastmaster: The haste on this thing still has be interested, alongside its synergies with the power matters archetype. Trollbred Guardian: The cheap adapt cost could well warrant an inclusion for this guy. Combine Guildmage: No. But it makes me consider Zameck Guildmage which can have its first effect be stacked with enough mana. Still probably not. Frilled Mystic: We finally have a Mystic Snake. But... The extra coloured mana just feels a bit much. Rhythm of the Wild is a likely inclusion; it feels like a better take on Fires of Yavimaya which I like as a concept. Sunder Shaman would be an inclusion I would make in the absence of the previous card and if I had more than 2 slots per guild. Sphinx of the Guildpact: Say what now? Snap inclusion since it is exactly the kind of card I love, even outside its raw power level.
I like Gruul Beastmaster. It fits the sort of power matters decks for which I keep Druid's Familiar around better than the latter since it is also a beneficiary of having its power boosted with equipment and suchlike. The potential for haste is also very nice in its own right. The card might very well be somewhat durdly but it is the kind of durdly for which I live.
@ Silhana Wayfinder: Holy moly. I mean, I suppose Elvish Mystic is unconditional and never whiffs but this feels like such an upgrade for our purposes, given that it has that minimally viable body. Digging deeper into your library is also always welcome to enable strategies reliant on specific build-around cards; in this case, creatures such as Kwende, Pride of Femeref or Anger.
Arrester's Zeal actually seems pretty interesting unless I am missing some crad which just plain gives the effect for the mana without the condition.
Forbidding Spirit appears nice but basically just states 'next turn, target opponent must choose between playing on curve and attacking'. I would need to hear about results.
Pteramander: Get in mah CUbe!
Dagger Caster: A good amount of Goblin Chainwhirler for our format. But perhaps the worse stats just do not cut it.
Light Up the Stage: Good CA in red.
Smelt-Ward Ignus: Big maybe; it is still an interesting tradeoff to pull that trigger though the base creature could be better.
Gruul Beastmaster: The haste on this thing still has be interested, alongside its synergies with the power matters archetype.
Trollbred Guardian: The cheap adapt cost could well warrant an inclusion for this guy.
Combine Guildmage: No. But it makes me consider Zameck Guildmage which can have its first effect be stacked with enough mana. Still probably not.
Frilled Mystic: We finally have a Mystic Snake. But... The extra coloured mana just feels a bit much.
Rhythm of the Wild is a likely inclusion; it feels like a better take on Fires of Yavimaya which I like as a concept.
Sunder Shaman would be an inclusion I would make in the absence of the previous card and if I had more than 2 slots per guild.
Sphinx of the Guildpact: Say what now? Snap inclusion since it is exactly the kind of card I love, even outside its raw power level.