I remember seeing this thread when I first joined up and trying out some basic implementation in my first drafts of my cube, but they didn't really work out all that well. Lifegain was a hard theme to really develop at a higher power level and there weren't a whole lot of enablers that could slot into other archetypes cleanly. Half a decade later, I think you can absolutely implement this effectively with the critical mass of effects we've had. I do think the core of it has shifted more from a lifegain deck to an Aristocrat style death by a thousand cuts build.
I've dabbled with
Teysa, Orzhov Scion EDH builds a couple of times like 4-5 years back and remember how much work it was to build a deck with a critical mass of Aristocrat effects to make things work. You really had to dig deep here and there to get there. Flash forward to 2020 and and I have a buddy who runs it as his main CMDR and have noted the number of
Blood Artist type effects having been greatly supplemented the last few years.
Zulaport Cutthroat being printed was a cause for celebration way back in 2014 as a second copy at a reasonable mana cost, but now it feels like we get some iteration of that effect once a every year or so.
Sidenote: I feel more and more that EDH is a great exploratory medium for Riptide Style cubes. There's a lot of overlap in finding synergistic pieces and interactions to maximize card density and there are a lot of gems to be gleamed. EDH is the main way I've been playing Magic the last couple of months and it's definitely helped re-ignite my passion for cube design after I was kinda burnt out for a bit. If you're ever in a rut, I think looking through the decks possible in the format is a great way to reboot yourself.
Anyways, I'm all for it if you're trying to make this kind of package work though, it's all about having a critical mass of enablers. The biggest obstacles I see to making Lifegain work as an archetype or subtheme in Cube are ways to make it mechanically distinct.
Based off my experiences in EDH, I'd say the best way to do that is to identify the core gameplan and to me it's all about building up life to use as a resource and then converting it into something that has a tangible effect. Gaining all that life doesn't mean a damn thing if it's just sitting there as a buffer before your opponents can overrun it with their own gameplan. It needs to be actively doing work for you and impacting the game, can't just be a passive stockpiled resource like Energy in much of KLD Constructed. I think you can definitely center this in B/W with some fringe support elsewhere in most cubes today without using up too many slots on narrow cards.
So we've got the core Aristocrat package to enable multiple lifegain and drain triggers off creatures dying:
You can also utilize the more narrow options in creatures that trigger off ETB with Soul Sister type effects. This was more the core of the idea way back when it was first being explored IIRC:
There are a ton of sac outlets to give you an alternative angle to generate death triggers and/or value aside from combat:
How do we go about generating multiple bodies? We had a handful of effects already with stuff like
Secure the Wastes, but Ravnica 3 gave us the motherload to help supplement this section with Afterlife cards letting you double dip:
Ways to generate card advantage off the lifegain and death triggers include the aforementioned Yawg in addition to:
I also like that there are great overlaps with tokens and recursive aggro with
Bloodsoaked Champion and
Gravecrawler and you can easily overlap these different strategies in your gold section with signposts like:
Also consider that a natural crossover is into B/x Stax decks with your increased ability to convert life into additional resources, thus giving you a way to reload after grinding down resources:
If you want to get more durdle-y, you've also got combo loops that can be assembled with things like a sac outlet +
Reveillark +
Karmic Guide. Or a better one that's more efficient mana and curve wise is something like sac outlet +
Anafenza, Kin-Tree Spirit or
Metallic Mimic +
Murderous Redcap or
Kitchen Finks. There are just a ton of potential avenues.
Finally, you have some finisher type cards to round off your curve by giving you additional reach and a way to utilize the multiple bodies you've generated on board:
And then you just round off your deck with some choice bits of removal and interaction and bam! You've got a stew going.
I think there are just so many more non-parasitic options available to you nowadays if you really wanted to implement this archetype effectively. Not to mention that new Exquisite Blood on legs that was spoiled yesterday; just an insane win-con that can also grant mass lifelink off an activated ability. It's like a tidy package of
Whip of Erebos and
Exquisite Blood minus the durdle.
PS: This is all just a subliminal PSA to try and convince more people to include
Brutal Hordechief in their lists. My beautiful boy has never failed me and has been one of my favorite cards since I first added him in after the Fate Reforged prerelease. Just do it and thank me later.