@thecravenone Iam not sure if you are just mocking the fringe format or if you are actually interested.
It's a UB deck with rituals, petal, LED, a ton of cantrips, tutors like personal, mystical, merchant scroll and stuff like lim duls vault. For protection i have some cheap countermagic, discard (inquisition is obviously insane) and few removal.
It's all about finding Doomsday and either go the easy route: TOP Predict, Labman, unearth, BS, - BOT. Which is cheap and easy to pull off but can be disrupted by removal.
Or go for: TOP Ideas Unbound, Remand, Brain Freeze, -, - BOT
This storm kill is usually very hard to disrupt, but costs a ton of mana and you can't to be able to kill the same turn as casting Doomsday.
Of course all of those can be modified and the usual doomsday stuff. Sadly a lot of great cards like black tutors, yawgwill, Necrosis, fast mana etc. are banned.
It's really fun though I love when I get to play.
Hmm, are there Oath creatures that win the game on the spot in duplicate? Yosei probably does in most board states (keep cloning/Oathing copies to take indefinite virtual extra turns) and is hard-castable. Are there other back-breaking leaves-play or enters-play effects? Or taking another angle, what's the best hasty evasive creature these days?
So I've been screwing around with this thing casually, and it's really fun. Not sure it's vintage-level power, naturally. But, it can be tutored out and then it gives you a useful mana sink turn after turn. If you get Sai, Master Thopterist going with it or happen to be running other Thopters, it gets really powerful.
The deck I stuck it in has Ornithopters, Roterothopter, and Pilgrim's Eye. They're all pretty terrible, but Goblin Welder at least makes Eye sort of workable.
I think to truly evaluate this card you really have to look at the entire class of Ophidians, and psuedo-Ophidians. We have a ton of versions of that card now. Just to name some of the ones that I remember seeing people play in Vintage at one point or another:
Finkel (Shadowmage Infiltrator)
Ninja of the Deep Hours
Edric, Spymaster of Trest
Azra Oddsmaker (ok this one is new too!)
Baleful Strix w/ Welder
Sword of Fire and Ice
Asylum Visitor (I was really high on this card)
Hypnotic Specter and friends
Now despite this list being very long and not even complete, I dont think any of these cards are seeing play right now. That isnt to say that this card isnt playable, but it is to say that this card has to succeed in an area fairly saturated in with good cards that arent seeing play.
What it does better it seems is that it is a better clock than most of these other cards. It's also on the higher side of synergy with other creatures along with Edric, Ninja, and the new Azra Oddsmaker. Its also blue so it pitches to Force. So it certainly has a number of benefits that if you can leverage then it can be a better option than others.
What it does worse than others is getting through blockers, and it needs to attack unlike Bob, Strix, Visitor. Unlike Finkel or Selkie, it doesnt have evasion. Unlike Ohran Viper or Flamespeaker, it doesnt have a mechanic to punish blockers. So I think certainly it needs more help in order to trigger compared to these cards.
So where are we at in terms of a deck to maximize this card?
Plays Force of Will.
Plays Snapcaster, Clique, Trinket Mage and/or other creatures with CiP effects.
Plays enough high CC spells / Sensei's top to maximize damage.
Plays enough remove /pump spells to get it through blockers
It sounds awful close to wanting to be in an Outcome deck, except for the last part of needing cards to clear its path.
That card looks like a one off Tinker target in Grixis Thieves deck. Some play Wheel of Fortune for extra style and winning. If you don't want to win (or play Jar instead), play this. It also happens that this new jewel is also a good mana sink for colorless Mana Drain which Thieves also runs and you can now convert all that colorlessness into spicy colours.
And I guess you can always steal it back with Dack!! not.