SolePilgrim Would Theme/Gimmick work? Can you please give some more details?

Last_Laugh I wish it was prerelease scheduling. Life outside of M:tG is stepping up. Nothing bad, nothing I can't handle, just deadlines and a need to focus.

Helenhighlights How about Pariah's Shield?

The Burrowing Blight

Legendary Creature - Insect

At the beginning of each end step, if you control fewer than five Insect creatures, create a number of 1/1 green Insect creature tokens equal to the difference.

Creatures you control with 1 power have first strike.

, : The Burrowing Blight deals X damage to each other creature. Activate this ability only as a sorcery.

0/4

Sorry Zask and Grist, this one's for Gruul.

Create an elk.

Don't know if anyone's paying attention this, but I'll keep it for my own notes. Not even the "villains from across the multiverse" set has anything approaching a bad guy, unless there's something we don't know about Miriam, Herd Whisperer. On to Duskmourn with a vague, desperate hope.

Last_Laugh Initial thoughts, and I'll dig into these more when I have time (very busy through the weekend):

Attack triggers are worth looking into, but they're not a snap add yet. Possible, needs review.

Damage triggers might be too narrow, or too broad. Maybe too many cards have "whenever CARDNAME deals combat damage" triggers? Unlikely at this point, but I'll check it out.

Death triggers would have a lot of overlap with Aristocrats. Maybe Aristocrats is a subset of this, but I'm trying to cut down on hubs that entirely included other hubs, and this feels like one of those.

Double triggers is a maybe, to be reviewed. Just doubling triggers isn't much of a theme in itself. What does Bristly Bill, Spine Sower have in common with Solphim, Mayhem Dominus besides the word "double"? All the Legendaries that double something either double counters, which is a hub; damage, which usually falls under burn or something similar; or power and/or toughness.

Not rejecting any of these off hand, but I want to get a feel for how they would make the most sense before making them.

Kavle It's possible to post an incomplete deck by checking the "Is prototype" box on the deck creator page.

Also, people use the maybeboard in different ways. Some people use it for cards they intend to add, some use it for cards they've taken out, and some use it as the name suggests, cards they're considering. So skipping over the maybeboard is pretty common, unless it's specifically pointed out.

Razor Boomerang

Artifact - Equipment

Equipped creature has "Unattach Razor Boomerang: This creature deals 1 damage to any target. Activate this ability only once each turn."

At the beginning of each end step, if Razor Boomerang is not equipped to a creature, attach it to target creature it was attached to this turn.

Equip

Create a card that makes either Worm tokens or Wurm tokens.

If you can reliably hit a 20-power creature, Mayael's Aria is an upkeep win condition. So it's slow, but if you keep your board stable and protected, it wins games. Black Market Connections is more generally useful, but doesn't close out a game by itself.

If you feel like the deck is well-covered in fundamentals like card draw and mana fixing, and can reliably go tall enough, Aria can win games that have stalled out. The +1/+1 counters and lifegain are useful, but may not be able to completely recover a losing game or break open a stalled game. If draw or mana are consistent or even occasional problems, I recommend BMC.

28 mana sources in a Ninjutsu deck is kind of a lot. Do the Mistvein Borderposts have any specific purpose aside from mana generation? Related to this, how do you use the Drift of Phantasms?

Ninjas usually go for a more tempo-based approach. Ninja of the New Moon can deal lots of damage fast, but it's often better to focus on speed, consistency, and disruption rather than raw damage.

As I understand it, courtesy of Mark Rosewater and contrary to a semi-serious prediction of mine from several years ago here, Jace was simply disguised/illusioned as Ashiok. It's still possible Jace will be Ashiok with some time funkiness, but they're currently two separate entities.

Cling to Life

Instant

Prevent all combat damage that would be dealt this turn. Return target creature from your graveyard to your hand. You gain 2 life.

A lich will never die just once.

Decent power uncommon.

Same challenge.

Yes, Karn, the Great Creator can put an exiled Ring of Ma'ruf into your hand. The updated wording on Ring is simply

• , , Exile Ring of Ma'rûf: The next time you would draw a card this turn, instead put a card you own from outside the game into your hand.

So the Ring exiles itself as part of the activation cost, allowing Karn to add it to your hand.

The old wording was created when interacting with objects not immediately in play was still a novelty, and the exile zone didn't fully exist. (To be fair, almost everything was a novelty at that point.)

Also, you need double square brackets to link cards, not just single square brackets.

[[Ring of Ma'Ruf]]

Coward_Token It could be an interesting EDH deck. Satoru on top, a bunch of self-mill and discard, the bits of a 60-card Dredge deck, some reanimator stuff. Not sure how well it would work, but it sounds fun. I might try it.