I see, you can tell what they are because they say on the card.
What an interesting skill! I'll just let myself out now.
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No, copies are not cast.
It does hose/hurt a lot of Legacy strategies pretty hard from what I can see though:
Dredge
Miracles
Chalice of the Void
FOW / Daze
Chrome Mox / Mox Diamond / Lotus Petal
Blood Moon / Trinisphere / Ensnaring Bridge / Dismember / Show and Tell before turn 3
Snuff Out
I don't think this card is all that amazing, but it would be a pretty hilarious way to break the symmetry of Dream Halls.
Growth Spiral has some interesting implications for blue-splashed Turbo Depths, which is becoming more common (Flusterstorm sideboard.) It's an instant speed Explore, which seems ok, but probably unplayable. Putting lands onto the battlefield at instant speed, other than fetching or Crop Rotation, isn't really something we've seen before. Lots of gotcha tricks can happen now that were limited only to Crop Rotation before: Wasteland, Ghost Quarter, Karakas, Maze of Ith, Bojuka Bog, and more that I'm missing. It's interesting to have a land drop on an opponent's turn, making Depths/Stage/Hexmage a potential instant speed combo with hidden information.
I like the idea of the 2-mana guild Ascendancy cards too, excited to see what other variants come out of it.
It's not likely UW that will play it that much, but Humans. This is likely going to be played there.
UW against Tron? Has to be in the side, because you want Terminus live game one. I would rather have Damping, it hits Storm too.
It also stops Elves from casting early NOs (or higher CC GSZs, depending on the board state)
Lavinia + Armageddon seems like an absolute wrecking ball, though. They can neither FoW nor Daze it for free, so once they're tapped out, they're fucked. The first ability stops any higher noncreature CC spells and good luck with no lands in play. The question is how to break the symmetry best. CoW seems like a good candidate, considering you can recover lands from Armageddon evey turn and with Wasteland/Ghost Quarter, you can lock them up even further, with or without Armageddon. Maybe a WU Stompy deck? Trophy Mage could fetch goodies like Trinisphere, CoW or equipment, even Chromatic Lantern wouldn't be too shabby here as massive mana fixer and post-Geddon mana source. Throw in some Mox Diamonds for LD resistance, mana fixing and CoW synergy. Tabernacle would be great (either MD or SB, depending on the build) with Armageddon, especially with a Chromatic Lantern in play to tap for mana.
Edit: Some people have mentioned Knowledge Pool to combo with her. It locks the opponent out from playing any spells anymore unless they're uncounterable.
Between Azorius Signet and the UW ODY filter land, you could cast her in a UW Stompy shell pretty easily, if that helps. Flagstones of Trokair for Armageddon too. Toss in Teferi and Jace at the high end and you've probably got a solid tier 2 deck at least.
Maybe as a starting point:
4x Lavinia
3x Stoneforge Mystic
4x Trophy Mage
4x Chalice of the Void
4x Force of Will
3x Sorcerous Spyglass
1x Crucible of Worlds
1x Trinisphere
1x Sword of Fire and Ice
1x Batterskull
4x Armageddon
2x Jace, the Mind Sculptor
2x Teferi, Hero of Dominaria
4x Thirst for Knowledge
4x Azorious Signet
4x Mox Diamond (Chrome Mox?)
4x Flagstones of Trokair
2x Plains
2x Island
2x Tundra
4x Ancient Tomb
4x Wasteland
And that's 64 cards, but whatever, it's just a theorycrafted starting point for a more serious discussion. But I mean, looking at that, I see a lot of disruption and stuff, but I'm not sure it's actually better than anything out there right now. Really depends on how Lavinia plays in practice.
The OD filter land sucks since it doesn't produce mana by itself. Azorius Signet is way better as filter, especially as it doubles as ramp. Given the high amount of artifacts, Karn might fit the deck as well to complement Jace in the 4CC slot. A single copy of Karakas should probably be in there as well.
Non-creature spells, creatures still get through.
edit - this card seems like a blue chalice . . . how is it not going to be slotted in 2-4 into Miracle decks and make them even more annoying? You don't need to go the whole 8 chalice route with Lavinia and Chalice, just sort of make room in existing Mircales and make people's lives worse. Maybe also figure a way to put some wastelands in there?
Knowledge Pool exiles cast spells (including creature spells) and allows you to cast other spells exiled with it - for free. And what does the second ability counter? Free spells - this isn't limited to noncreature spells, unlike the first ability.
You would need stuff like Abrupt Decay or Karakas to break through that eventually.
Just play Bant with like 8 Mana dorks, this guy, Ramunap Excavator, and geddon. Can even do it with green soon package
https://pbs.twimg.com/media/DupbB4VWsAAJFZS.jpg:large
Not really impressed by this hatebear.