Though extremely powerful, Time Spiral is nowhere near as good as Timetwister. Costing double and exiling itself are serious drawbacks. Untapping your lands is very strong but requiring a 6 mana investment before you do it is a LOT.
Despite being legal in Legacy, the only deck that plays Spiral in Legacy is one of the High Tide variants.
Despite being unrestricted in Vintage, Spiral is rarely seen. Whereas Timetwister (restricted) is seen often. It's in most combo decks as well as control/midrange decks that include some combination of Narset and/or Bowmasters and/or Hullbreacher.
Neither Timetwister or TimeSpiral show up in Vintage at all anymore, the only Meta Deck that runs TimeTwister is a Standstill deck that is basically non existent in the meta.
TimeSpiral costing more mana but untapping lands was a very important thing for the Storm decks as it meant that you could have extra mana for your storm turns, but Bolas Citadel replaced it.
That is why I went to Vintage Cube because it is the only format that either one is remotely seeing real play in.
Primeval Titan is damn good. It still sees play in Modern (and some very fringe Legacy play) even after all these years, mainly in Amulet Titan but also in Scapeshift (if anyone still plays that deck). But you can't tell me that it's worthy of being banned when a card like Yawgmoth's Will isn't.
Sylvan Primordial is a joke and sees literally zero play, as evidenced by its cost being near-bulk. It's only good for EDH, yet is banned there because the retards that only play EDH think it's too strong.
Sylvan Primordial is incredibly powerful when you have 3 opponents, you are getting a 6/8 destroying 3 permanents and getting 3 (Non Basic Forest) lands. It is a massive swing in board presence even when it was banned and Lands have only gotten better since then, like I said..Sylvan Primordial can be "Destroy 3 Non-creature permanents, get 3 lands and Surveil 3" now.
On an enter the battlefield ability..for 7 mana compared to Ulamog the Ceaseless Hunger who is 10, doesn't ramp you and only gets 2 permanents..and can't be cheated in, that is Card Advantage on Par with what Atraxa will often do.
And it will only has and will get stronger, lets all be glad that green has had bad luck when it comes to Utility lands but they will accidentally print one that isn't trash.
Prime Time is one of the singular longest running decks in the Modern Meta, and directly gets more powerful every single set that exists because every single set has Utility lands of some sort now, Even if you ignore Field of the Dead from the Equation you can still grab Thespian Stage and any card that is really good with it like Lotus Field or Dark Depths.
Or if you really hate your play group, Get that new Talon Gate card, Phase out your Prime Time and then get Glacial Chasm so they can't damage you for the turn that way your Titan gets to attack.
Primeval Titan is more than Damn Good a mistake card that should have gotten Banned back before Modern Horizons became a thing and is basically the only Pre-Modern creature that can stand as the center stage of a Modern Deck post Modern Horizons, and is one of two decks from Pre-Modern Horizon's era that didn't get a direct infusion of cards (I am talking about Tron) that can compete with those decks.
The other is Burn.
When I see shit like Sylvan Primordial, Primeval Titan, Sundering Titan, Upheaval, Biorhythm, and Sway of the Stars are banned, I wonder why cards like Vampiric Tutor, Demonic Tutor, Sol Ring, Atraxa, Grand Unifier, Thassa's Oracle, Demonic Consultation, Yawgmoth's Will, etc aren't.
Sundering Titan is banned because it's trigger goes off on both entering and exiting so you can blink the shit out of it
Upheval is banned because it resets the game (And really shit like Tatyova and Aesei do not fucking need the ability to repuke all the lands)
Biorhythm can be a very sudden win out of no-where with a single card.
Sway of the stars like upheval is banned because it effectively resets the game
Vampiric Tutor is marginal in commander, you give up a card to get one. It is good but not amazing
Demonic Tutor isn't that great outside of Combo, like you should play it because it gets you what you need..but adding 2 Mana cost to the best spell you can get in that moment isn't the most mindblowing thing on the planet.
Sol Ring should have been banned but Sheldon was a faggot who never had the ballsack to do it.
Atraxa is a dumb card, but she isn't the most obnoxious 7 Drop in the game (Toxril says howdy)
I have already said Oracle shoudl be banned in every format
Consultation isn't an issue without Oracle
Yawgwill is good in storm and that is about it, and its not even really the best of it's class because Past in Flames exists and can be cast from Graveyard.
I wish they split ban list into EDH and CEDH and went much more aggressive in banning in the former.
I just wish they would have the balls to kick shit like Oracle, Crypt and Sol Ring out, like are CEDH players really gonna cry if you make them play games that don't end on turn 3?