Following hot on the heels of "Nicol Bolas vs Phyrexians vs Eldrazi" and "Mirrodon Pure: Yes, really, this time" comes "Ravnica III: Return to Ravnica Again, Gruul Harder, Electric Borboryloo"
Once again, like the change from hybrid guildmages to gold guildmages, several cycles from the previous blocks are repeated with a slight twist.
This time, It Has Been Decided, there will be ten hybrid mana guild charms. Rosewater protests the design space in hybrid is too small to have that many overlapping effects, but you think you can prove it's possible. Design an example charm for one (or more) guilds.
A charm is an instant or sorcery spell with a choice between three effects, each of which is weak for the mana cost.
Don't call it "Gruul charm" because that's already a different card, but you don't have to come up with a final name for it now, just a codename so it's recognisable. "Borborygmos' charm" or "RG hybrid charm" or "Jackv's gruul charm" etc are all fine. If you repeat a colour someone else has already submitted, use a different name just to make telling them apart easier.
The mana cost has to have hybrid mana and no monocolour mana, but otherwise can be what you like: , , , , etc.
Remember, hybrid spells should fit the colour pie in either colour.
But it's ok to stretch a little if it's in flavour for the guild, even if wouldn't normally be in one of the colours (cf. extort)
Heh... now that I think of it, that would be cool. Dimir should totally have a card that only pops up as a foil rare, in the same vein as Super Secret Tech.
Woah. That's a little crazy how close Forbidden Charm is to Mirko's Charm. I guess those are just the 3 obvious choices when making a Dimir charm that costs HHH...
@Jm, yes. There's really not that much overlap in the end, something that Maro has commented about in the past. The same problem plagues (worse, even, which explains why there are only 2 hybrid nonpermanent UR spell... one of which makes tokens): for example neither color pair share an evergreen primary mechanic (Strictly speaking, green hardly gets vigilance, but since no other color than white does, that's not a problem.).
The OP's premise is way off the mark because he didn't anticipate a plot twist...Jace introduces the eleventh guild...The guildless faction. These are monocolored + colorless.
I was trying to make another simic charm and ended up with Tranquility Charm, but I put it in "Cards with no home", as it's an aura rather than a true charm...
Following hot on the heels of "Nicol Bolas vs Phyrexians vs Eldrazi" and "Mirrodon Pure: Yes, really, this time" comes "Ravnica III: Return to Ravnica Again, Gruul Harder, Electric Borboryloo"
Once again, like the change from hybrid guildmages to gold guildmages, several cycles from the previous blocks are repeated with a slight twist.
This time, It Has Been Decided, there will be ten hybrid mana guild charms. Rosewater protests the design space in hybrid is too small to have that many overlapping effects, but you think you can prove it's possible. Design an example charm for one (or more) guilds.
As an example I made Brute Charm in RG.
Added Forbidden Charm for Dimir. Shh... secret charms...
Heh... now that I think of it, that would be cool. Dimir should totally have a card that only pops up as a foil rare, in the same vein as Super Secret Tech.
Rotten Charm though I fear it's not very Golgary.
I created Firemind's Charm and Isperia's Charm.
Mirko's Charm was designed way back during Challenge # 081
Dimir's Secrecy Charm & Izzet's Experimental Charm & Rakdos's Havoc Charm
Woah. That's a little crazy how close Forbidden Charm is to Mirko's Charm. I guess those are just the 3 obvious choices when making a Dimir charm that costs HHH...
Legion Charm seems to fit quite well.
@Jm, yes. There's really not that much
overlap in the end, something that Maro has commented about in the past. The same problem plagues 
(worse, even, which explains why there are only 2 hybrid nonpermanent UR spell... one of which makes tokens): for example neither color pair share an evergreen primary mechanic (Strictly speaking, green hardly gets vigilance, but since no other color than white does, that's not a problem.).
Ooh, you're right,
is really hard. OK, let me see if I can make one with no overlaps :)
Sneaky Charm
Amuseum and I managed to make
charms that weren't that similar.
Also Pontiff's Charm and Loam Charm
And stretching the challenge a bit, a Selesnya/Gruul/Boros hybrid charm, (Horde Charm...
Somewhat surprised that Selesnya hasn't been taken yet, I created Health Charm.
Then I wanted to make an Azorius charm, and although it's definitely not where I started off intending to go I ended up with Skyknight's Charm.
Turns out Shiny_Umbreon already made ten of these, which he listed over here.
OK, so far we have:
: Brute Charm
: Legion Charm
: Havoc Charm
: Firemind's Charm Experimental Charm
: Isperia's Charm Skyknight's Charm
: Health Charm
: Pontiff's Charm
: Forbidden Charm Mirko's Charm Secrecy Charm Sneaky Charm
:
: Rotten Charm Loam Charm
Plus Shiny_Umbreon's whole cycle on Challenge # 081
I am impressed at how the names are varied but all obviously appropriate, that can be one of the hardest bits :)
Added Aether Charm and Pain Charm. Someone still needs to do Simic. Hexproof is obvious, but what else...
I made Clade Charm so that all the guilds would be represented.
Obedience Charm, another Simic charm.
The OP's premise is way off the mark because he didn't anticipate a plot twist...Jace introduces the eleventh guild...The guildless faction. These are monocolored + colorless.
Hence, Imperial Charm
I was trying to make another simic charm and ended up with Tranquility Charm, but I put it in "Cards with no home", as it's an aura rather than a true charm...
Added Cursed Dimir Charm, Cursed Gruul Charm and Cursed Selesnya Charm.
Simic Signet Charm and Wreck // Salvage.
After jmgariepy started the hybrid split trend, Jack created Hate // Anger, which prompted me to put up Fair // Square.
Added Heel // Tow.
super charms: Supportive Charm
Interrogation Charm has 3 modes , 2 that work from the hand....
Meditation Charm has 3 modes , 2 that work from the hand.
Viscera Charm has two spell modes and a graveyard mode.
Supreme Charm has a spell mode, a library mode, and a hand mode. Repercussion Charm has crazy stacked modes.
Boros Tutor Charm
Creation Charm has 3 modes, 2 that work from the hand.
Already did for a previous challenge about charms:
Ordered Charm Elitist Charm Intellectual Charm Creative Charm Intense Charm Underworld Charm Wild Charm Proactive Charm Communal Charm Adaptative Charm
Izzetification Charm