This is a source of never-ending debate within the cube community. Keep the gold cards balanced, or unbalanced? Where do you put the off-color flashback, the Wild Nacatls, the Kessig Wolf Runs? What about those pesky hybrid cards?
It's really more of a bookkeeping issue than a cube design issue at large. But I think that the way a lot of people keep track of multicolor might constrain them from having they best cube possible.
Here's how I do it, cross-posted from a comment I left on Usman's article this week. I'd be interested to hear other people's methods.
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I think the guild model, while useful for its time, has unfortunately locked people into a set way of thinking. As [Usman] pointed out, the losers in the guild model are hybrid cards.
Folks who strictly ascribe to the guild model need to come to the realization that hybrid =/= gold. Gold is harder to cast than mono-color; hybrid is easier to cast than mono-color. Gold needs colors C and D; hybrid needs color C or D. What I'm trying to get across is that hybrid is actually the opposite of gold. The only thing they share is their multicolor designation. Which, for cube purposes, shouldn't matter at all when it comes to figuring out which cards makes the grade. Actual card quality should be the guiding principle there. So classifying them together into one big ol' "multicolor" section is doing hybrid cards a major disservice.
Here's what I do in my ~450 cube (deep breath):
- Each color pair is allowed a maximum of 3 gold cards. These include actual gold cards (Qasali Pridemage), cards with off-color flashback that are only ever utilized with access to both colors (Lingering Souls), non-fixing lands with multi-color activation (Kessig Wolf Run), and creatures that rely on basic land types (I don't run any of these, but Kird Ape is your go-to example). Color pairs can have less than 3 gold cards, but not more. The bar for a gold card to make the cut at all is very high.
- Any and all good tri-color cards make the cut. The bar is exceptionally high for this elite club. I've only got two cards at the moment (Nicol Bolas & Maelstrom Wanderer).
- Any and all good hybrid cards make the cut. The bar is much lower for hybrid, since as we've established, they're easy to cast and the opposite of gold. A card like Curse of Chains, for example, is a serviceable removal spell that's currently in the mix. Fulminator Mage is also included in this model, despite an abundance of actual good Rakdos gold cards.
- The fun part. Establish a "colour ratio" for each and every multicolor card. For two-color cards, they would typically count as half a card in each color: Qasali Pridemage is 0.5 W, 0.5 G. Hybrid cards can be weighed according to how often they appear in their respective decks. Boggart Ram-Gang is 0.75 R, 0.25 G for me. And so on.
- Tally up colour ratios to get the total color representation across all multicolor cards. After counting the total number of "cards" represented across each color, note which ones are over and under-represented. Cut or add cards from the mono-color sections accordingly. For me, this meant cutting two red cards, and adding back one card each in blue and green.
Whew, that sounds like a mouthful. I doubt anyone actually read through all that. But if you did, and you keep your cube list in a Google Doc, which I assume most people do nowadays, it's actually easier to do this than it sounds.
Most importantly, it removes the shackles off of hybrid cards, which have been unfairly held down in too many cubes.