Creature Type Game

melono - A nice straightforward retool of Hunted Lanmasu that's pushed enough to promote the tribe in more aggressive/competitive builds. I like that you made the toughness 1 to make it easy to kill via burn or some indirect -X/-X, meaning that it's clear that despite being aggressively costed the drawbacks and answers to it are very real. Set-ready.

Flo00 - Interesting graveyard hate in theory but I think "died in combat" is a little vague and very restrictive. "Died during the combat step" or "Died that was dealt combat damage" (very rough examples but hopefully it gets the idea across) would be a bit more clear. I also this that dies trigger is a little too hard to control to turn this card into an efficient graveyard hate answer (plus you miss out on Wrath synergy). I would change it to just "for each creature that has died this turn" - it solves the problems this cards has and makes it a lot more playable.

viriss - I'm not sure what would imply Lanmasu have first strike or are goatherders, but it's still a very neat concept mechanically and I can dig it as a sort of all-new design to give Lanmasu some new design space. Set-ready, though I wish you'd given me a sentence of explanation or flavortext to give me an idea of why this Lanmasu is the way he is.

Jartis - I think this captures the riskiness of Hunted Lanmasu well and makes for some interesting monarch shenanigans but for six mana I think I would rather have Skyline Despot or Regal Behemoth. The potential easy loss of the creature itself is just a bit too much for its own good on an otherwise somewhat run of the mill creature, and losing their monarch-based ability is usually enough of a feel-bad to justify playing hot potato with the monarch for most Monarch-based cards.

It feels like you were going for a card that encouraged Monarch being tossed around but I think this is more gracefully accomplished by making repeatedly becoming the Monarch a payoff i.e. Custodi Lich. As-is, I would remove the last line from this Lanmasu and give it to a different, cheaper creature entirely.

thaneofglamis - Takes advantage of unexplored design space using an evergreen mechanic, and feels very much like something WoTC would explore in the near future. My only complaint is that at the body is a bit too pushed for all those abilities - Aven of Enduring Hope, Shining Aerosaur, etc... indicate that this card has both too much P/T and too many abilities. I would suggest either ditching lifelink or lowering P/T to 3/3.

(That said, I think this would be an excellent for promoting Scry-matters in draft, so that is a valid route as well.)

Overall there were a lot of solid designs but I do think it's important to compare your card's current powerlevel to similar designs. A lot of good designs fell short of being great simply by being a little too weak or strong.

1st: melono Sometimes all you need is a simple design that pushes the tribe and makes people take a second look at it. I think this is a good card for that - you could use it in anything from a political Commander deck to some kind of super-aggressive White weenie in its hypothetical standard (maybe in tandem with Ratchet Bomb). For a straightforward design, it had me thinking a lot about its potential applications.
2nd: viriss A great fresh take on what Lanmasu can potentially be.