Orzhov: Ugh. Um, Stillmoon Cavalier seems like it. Unmake isn't horrible but black and white don't really need another removal spell.
Yeah, unfortunately if you're not running Lurrus, Stillmoon looks like the next best. I don't really consider triple pip cards like Unmake in my hybrid section, since those aren't going to be run by something like Boros or Dimir.
Scarscale Ritual was fine when I ran it. Not great, but okay. I eventually replaced it with Dimir Signet. Discovery/dispersal might be the other card I consider, but I don't know.
Gruul: Firespout is OK but not what Gruul normally wants to do. Manamorphose is cool, but without storm or something how good is it? Samut, Tyrant Smasher is fine but not anything to write home about. Tattermunge Maniac serves as another aggro 1-drop.
I really like manamorphose in my cube, and don't support storm. It creates elementals with young pyromancer, triggers prowess for Monastery Swiftspear, Abbot of the Keral Keep, and Monastery Mentor. It also clears non-lands for Oracle of Mul Daya and Courser of Kruphix, and can clear off a card for Sylvan Library to look deeper. Reactive strategies are less likely to want it, but Red and Green tend to be pretty proactive, so it plays well in my experience.
Edit: I am running all 10 talismans. I also decided to run signets in my hybrid section for color pairs where I was unhappy with the options, since I feel hybrids and signets/talismans occupy a similar design space. I am admittedly running too many mana rocks, so I'm not exactly saying that's the right way to go about it, but it is what I'm doing at the moment.
Does Cemetery Puca do anything cool in cube? I like Mimic Vat and Cemetery Puca reminds me a lot of Mimic Vat except Mimic Vat gets ETBs and Cemetery Puca does not. Cemetery Puca works with Wurmcoil Engine and Thragtusk, and can work with Sneak Attack -- at least if you're sneaking in something like Griselbrand, Woodfall Primus less so. Is there something really nice I missed? Otherwise, I think the lack of ETB means it's not a consideration for cube. It looks like a cool card, though.
I'm going to be adding one hybrid for each allied pair with the MH1 update. The only one I'm really not sure about is Dimir. I would add all 10, but Orzhov, Simic, Izzet, and Dimir are all lacking good hybrid options. This is what I'm thinking at the moment.
UBScarscale Ritual: I really don't know about this one. The black half seems better than the blue side with black's recursive critters, but I could also see it making it in a non-black Ux deck.
BRMurderous Redcap: Persist combo was lightly supported since adding Rhythm of the Wild during the RNA update. Now that I'm adding Good-Fortune Unicorn, having another persist dude seems good. I would like to get Rakdos Cackler back in instead, but this seems more important for archetype support than Cackler.
RGFirespout: I used to run this when I had 3 cards per guild, but cut it when going down to 2. I remember it being decent, though. My cube's power level has jumped quite a bit since then, but I think this could still be a good add.
WGKitchen Finks: Already running this, but counting it as a hybrid instead of a guild slot opens room for Good-Fortune Unicorn.
Yeah, unfortunately if you're not running Lurrus, Stillmoon looks like the next best. I don't really consider triple pip cards like Unmake in my hybrid section, since those aren't going to be run by something like Boros or Dimir.
Scarscale Ritual was fine when I ran it. Not great, but okay. I eventually replaced it with Dimir Signet. Discovery/dispersal might be the other card I consider, but I don't know.
I really like manamorphose in my cube, and don't support storm. It creates elementals with young pyromancer, triggers prowess for Monastery Swiftspear, Abbot of the Keral Keep, and Monastery Mentor. It also clears non-lands for Oracle of Mul Daya and Courser of Kruphix, and can clear off a card for Sylvan Library to look deeper. Reactive strategies are less likely to want it, but Red and Green tend to be pretty proactive, so it plays well in my experience.
Edit: I am running all 10 talismans. I also decided to run signets in my hybrid section for color pairs where I was unhappy with the options, since I feel hybrids and signets/talismans occupy a similar design space. I am admittedly running too many mana rocks, so I'm not exactly saying that's the right way to go about it, but it is what I'm doing at the moment.
[180 classic cube]
[180 classic cube]
WU Curse of Chains: I used to run Judge's Familiar but was totally unimpressed by it. This seems like fine removal, though.
UB Scarscale Ritual: I really don't know about this one. The black half seems better than the blue side with black's recursive critters, but I could also see it making it in a non-black Ux deck.
BR Murderous Redcap: Persist combo was lightly supported since adding Rhythm of the Wild during the RNA update. Now that I'm adding Good-Fortune Unicorn, having another persist dude seems good. I would like to get Rakdos Cackler back in instead, but this seems more important for archetype support than Cackler.
RG Firespout: I used to run this when I had 3 cards per guild, but cut it when going down to 2. I remember it being decent, though. My cube's power level has jumped quite a bit since then, but I think this could still be a good add.
WG Kitchen Finks: Already running this, but counting it as a hybrid instead of a guild slot opens room for Good-Fortune Unicorn.
I'm also running Figure of Destiny in a guild slot.
[180 classic cube]