When Alpha and Beta sold out, WOTC needed new sets quickly. They made Antiquities in less than 6 month with the Brother's War and Phyrexia as the story
Drafna and Hurkyl discover Magic and founded the school of Lat-Nam to oppose the two Brothers.
Urza discover they were played by the Phyrexians and use the Golgothian Sylex to destroy everything and close Dominaria
The cooling of the climate is the main cause of the infighting that destroy these empires.
The school of Lat Nam became the City of Shadow and hide wizards.
The Conclave of Mage founded by Ith is another hidden place.
In the city of Soldev, Arcum Dagsson dig the ice for ancient artifacts of the Antiquities and find a way to end the Ice Age.
Sorin Relicbane, a fellow Soldevi, warn him that these artifacts will bring destruction again.
Some Soldevi turn into a cult of Phyrexia and become Soldevi Adnate, similar to the old Yawgmoth Priest.
Sorin Relicbane was right all along.
But the mages of Lat Nam, now known as the School of the Unseen, send their best student Jaya Ballard, who stop the Phyrexians with her witty flavor texts.
The terrible tales Kasib Ibn Naji talk about are similar to Jarsyl Diary (see Gate to Phyrexia in Antiquities.)
Notice how you can assemble them together like a voltron.
The captain Sisay have to assemble #UrzaLegacy, to fight the coming Phyrexian invasion, but Sisay get abducted by Yawgmoth minions, who bring her to the plane of Rath.
Rath is a strange expanding artificial plane made from flowstones.
Flowstone are Phyrexian nanotechnologies fueled by mana.
It seem to be pouring from a central location; the Stronghold
The crew also get captured or scattered in the wild
Greven is punished with a new spine for his failure of capturing the Weatherlight ship and its Legacy artifacts.
Back in the day, we were like; OH MY GOD, THIS IS URZA??? (first depiction of him)
She join force with Urza
Anything he destroy on his way just come back to block him.
He get owned and barely escape alive, if it was not of Xantcha helping him planewalk away.
Meanwhile, Kerrick, a Phyrexian sleeper agent summon negators in the academy and kill students.
Urza send Karn back in time to kill Kerrick, but it backfire spectacularly
You can't pass between zone without a special suit.
Urza only know the ancients Thran where the one who banished the Phyrexian from Dominaria.
The goal of the Tolarian Academy time experiments is to go back in time and ask the Thran how to deal with Phyrexians
In the volcanic land of Shiv, Urza discovers the Mana Rig, a Thran ruin, inhabited by viashino.
With the Mana Rig, Urza can build powerstones (mana rock)
Urza met the sleeper agent Xantcha while searching for Phyrexia. She's the one who helped him find the plane.
On Phyrexia, she stole back her Hearthstone containing her personality.
After Xantcha death, Urza used this stone to build Karn.
Later on, she will go to Dominaria and summon a lot of angels.
It had an appearance in the Mirage block, but Urza saga tie it to the main Phyrexian storyline.
Before that, it was just the place where the Shivan Dragon came from
He go back to Tolaria and with Barrin and the survivors rebuild the Academy. They find Teferi trapped in a slow time bubble since the explosion.
We see that one of this legacy weapon is the skyship Weatherlight.
The wizard Barrin summon Urza who summon help from Shiv and Yavimaya. It's a close call but they win. Having witness the Phyrexians danger, Multani give Urza a tree to build the Weatherlight
They battle and then Urza transfer the refugees in the Weatherlight and collapse the plane inside a single powerstone that will power the Weatherlight