This feels really similar to Powercult Salvation. Is the need for a instant that puts a +1/+1 counter on a creature that strong that you add it twice to the set?

The death trigger seems more complicated than necessary. The tribal component of the set doesn't seem developed enough to make you want to care too much about having the choice between two so similar tokens. You'd easily get away with pre-defining one of the tokens here.

Also at the cost of the need for the creature to die before you get the token is quite a hoop to jump through. At that cost you could get the token and the +1/+1 counter with no hoop - like a Backup Agent with flash.

Considered making this "each player" instead of "each opponent" to enable self mill strategies, but I was worried that could be too efficient for self-mill strategies.

On this side of Tornipuch, zombies and vampires are created by demons and have the innate potential to become a demon if the undead's mortal will succeeded in being fulfilled. The reverb here the new demon embracing their power and has bound followers as zombies like they had once been.

Lore example: Demon Lord Neraltis had once been a mortal who had an insatiable hunger for arcane knowledge. That mortal sought to learn from a demon lord, but eventually the mortal succumbed to that demon lords' power and will and became a zombie to represent that hunger. Once that zombie had found a way to sate that hunger, they had an understanding of magic that transcended mortal form and took the name Neraltis.

This is an ability word. I'll have to italicize Reverb on cards later.

The intention of cards with Reverb is that ability used from the graveyard should feel lesser but be adjacent to the instant or sorcery's normal effect.

This set is an instant and sorcery focused set, hence the choice exiling the instant or sorcery. I was attempting to create a flavorful parallel cycle to the artifact focused other side/reality of Tornipuch which has Inspired Bridge(after seeing Mutagen tokens, I've confimed that Cog tokens leave much to be desired, but that's a problem for Tornipuch: Grinding Towards Power).

The activation cost being tied to a theme of this set initially felt like enough, but you bring up the point that a vacuum effect would probably cost to activate. This makes me wonder if merely including the instant/sorcery requirement is enough and if a mana value of perhaps should be added to activate the ability.

Why does a white-black land use such a blue-red associated set of mechanics (caring about instants and sorceries, caring about casting noncreature spells, looting/rummaging).

What exactly is going on in this set that makes it so an ability with in its cost requires the clause "Activate this ability only once each turn"?

EDIT: Seeing the rest of the cycle, I at least get the first part. Apparently this is a strict cycle like Sinister Hideout/Secret Passage/Silverquill Campus, not a loose one like Rivendell, Lilypad Village/Agna Qel'a.

Acknowledging that it's partially explained. Adding looting/rummaging to the list of draw-smoothing abilities of scry, surveil, investigate, boardcycling, cycling etc. seems like a logical next step. I'm still befuddle by the weird complexity of the cost/condition and how it relates to how this ability in a vacuum probably would be: ", : Draw a card, then discard a card."

The question is both, whether exiling a nonpermanent card and then delaying the looting until your next noncreature spell is a cost at the correct level, and also (and more importantly) what the whole song and dance of this even means. The weirdest part is that both encourage the same thing: If you use this ability multiple times, then you probably exile the spell you have cast for the previous activation anyway.

There is also the fact that usually draw-smoothing abilities on lands like the ones linked above are tools to give players something to do late-game (among other things, obv, but as a general idea) when they have more lands/mana than they know what to do with, but might be concerned with drawing too much land over the spells you really want. So a straight-forward mana cost to activate seems ideal. OTOH a similar ability that costs no mana, but only works if you still have more spells to cast strikes me as a questionable variant of the same idea.

Whether you actually want to push for this much noncreature play across all colors is another question, but one that is more tied to the environment.

Is reverb supposed to be an ability word? It looks like i might be, but non-italics and the weird order of symbols make me wonder whether something else is going on.

The natural life cycle of a card suggests you'd cast this from hand before reverbing it from the graveyard, which is not the expeted order of these two effects. You'd expect to tutor for lands early in the game; once you have accumulated some lands you'd look to use the effect that makes all lands better (you'd need e. g. at least four basic lands before you break even on the additional mana).

Without the reverb stuff this is a two-man High Tide/Bubbling Muck in a more well chosen color. I'm really not certain that I like it at that spot either. Real mana doubling is meant to be abused, which is why Mana Reflection is so prohibitively cost: You usually have to wait a turn to get ahead with it.

I see this as a take on red rituals more than a take on green ramp. And considering modern levels of rituals, I'm not certain where this is compared to Geosurge.

It feels like the design is disjointed (though I'm not looking at the set context right now) in the sense that this is a mana fixing card that also wants you to play a lot of copies of the same basic land, which is not a good kind of tension, I imagine.

Stilts to keep the buildings elevated in a swamp

I knew vigilance was pushing it.

Damage prevention is something I want to stick with though.

Yeah, this is unprintable at common, and damage prevention is basically unprintable at all these days