Congrats on the finish.
I think you are definitely into something in terms of a mana sink. I’m not sure if a Companion is the best option there, they are nice for the guarantee, but the deck limitations are pretty severe for the effect now with the tax included in their cost.
What other mana sinks are there? Well there is Urza, and there is also Golos. That is a couple of very powerful ones, especially with big spells in your deck.
You can also just go down the route of using him to reliably generate 4 different colors of mana. This may be the intersection with a companion, Jegantga, but that would exclude basically all pitch spells. So the deck would need other ways to interact. You can throw in a Coalition Victory here as an out to instant win some games.
This is to say there are probably a few routes one could go with this.
Yeah, I've played it with all the 0-drops and non-creatures, but it feels underwhelming to me to have to wait until turn 2 to start playing the namesake cards of the deck unless I have a mox/lotus opener. It would be nice if they actually just started printing 1 mana creatures that weren't terrible for control strategies.
Nice, Matt! I will look forward to list whenever you are ready to share.
I don't know why you would cut moxen to add more 4+ drops to a deck. That doesn't make any sense. This card plays very well with moxen as almost all of them are on-color for it. The ideal scenario as I laid out would be to put yourself into a position to drop it on turn 2, and then have a huge turn 3.
This card seems like it will get banned in Standard. Just insane to have 9 mana if you played it on turn 4 or have it come down for free on that turn 5.
I agree the Sylvan Library interaction is great. The interaction with Wrenn and Six is alone is also pretty crazy. Also just blocking for any of your planeswalkers is great (4/4 > 3/3 for Oko). Generating an absurd amount of life + mana is also great. This card does so many great things.
The mana cost isn't all that prohibitive in the right deck. Deathrite + an on-color mox (4/5 moxes are on-color for this) lets you play it on turn 2. On turn 3 with a fetch land you now have 9 mana. That lets you power out pretty much anything you can think of (okay not Griselbrand), and even drop multiple planeswalkers in one turn.
Karn was absurdly broken to the point of restriction. This card is obviously no where close to that, nor are any of these other 4 cost cards or planeswalkers for that matter. Even Narset that was also restricted pales in comparison to Karn's power level. One of those cards that they definitely pushed super hard.
I don't think Jace is bad, but it seems outclassed by other planeswalker options now. Decks are mostly just playing it because its less colors as you've indicated, and they want that versatility that a planeswalker brings.
As the discussion is on Omnath, like I've said, I think his/her playability would stem from the fact that its not actually costing you any mana at all.