"A pleasure!" hissed Urza in exasperation.

"Welcome, Master Barrin, to Zhalfir."

Barrin studied the extended hand with feigned caution before grasping it. "No shocking grasp? It's almost a letdown, Teferi. Still, it's nice to know you haven't reverted to your old tricks."

Teferi shook his head vigorously. "Only new tricks, Master Barrin. Plenty of new ones."

"He won't let us help," Urza blurted in place of a greeting.

"Won't let…" Barrin echoed incredulously. He searched Urza's queer eyes, looking for signs of humor. It was a futile search.

Teferi's eyes brimmed with joy. "It's not that I won't let you both help-just not Master Urza alone. No offense. If Tolaria taught me anything, it taught me that Urza is a danger to himself and everyone else unless he's working with his lab partner."

"Which would be me," Barrin said through tight lips. The two masters of Tolaria traded rueful looks. Teferi had always been a bright, good-hearted troublemaker-just what Barrin and Urza needed. "Well, I'm here, now. How can we help?"

Teferi took a glad breath, stroking his chin and looking out at his proud forces. "That's a good question. The Mage Corps of Zhalfir seem to have things well in hand."

"Impressive," Barrin said. "I have never seen spells used this way before."

"Phoenix flocks," Teferi said. "An innovation of mine. It keeps the battle in the air, keeps the casualties to Phyrexians. Our warriors are all creatures of fancy-ideas battling monsters. That is very appealing to me."

Barrin watched tracers of white-mana magic rise, slim and graceful, from a mage on the dusty field. The power spread outward, blossoming into a great spectral eagle the size of a mammoth. Its wings swept out. They could cover whole companies. With a shrieking cry that raked the heavens, the enormous raptor crashed into a Phyrexian cruiser. Pinions of pure energy enveloped the ship. The bird's figure disintegrated. Lines of magic limned every hackled spine and barbed strut of the ship. The lines solidified into unbreakable cords of power. They constricted inward. The shimmering white force cut beneath armor plates. It sliced bulwarks and causeways. Sparks showered from the cut marks.

"Why don't they simply land, crushing your forces?" Barrin asked.

"Watch," Teferi replied quietly.

The cruiser that had been overwhelmed by the spectral eagle began to disintegrate. Sections of the ship cut loose and tumbled away. Strangely, though, the pieces did not plummet toward the savanna. Instead, they rose, tumbling into the air. Some of the hunks impacted Phyrexian ships above. Sharp wedges lodged in the bellies of the craft. No, not the bellies. Only then did Barrin realize that all the Phyrexian ships floated upside down in the sky.

"It's a simple but powerful enchantment, reversing the pull of Dominaria," Teferi said. "It's a time-field effect, like those I learned on Tolaria. In backward time, the world repels rather than attracts objects. Meteors leap into the sky, feet are propelled away from the ground, and instead of stumbling, drunkards vault upright. I've extracted that single vector of movement and enacted it in a broad space above the plain. My sorcerers can stand on the ground, but a hundred yards above their heads, gravity reverses itself. Those ships are laboring toward the ground just as they would labor into the air. If any of them actually neared the envelope of the reversion field, they would plunge to their destruction."

Above the massed fleet of Phyrexian ships ascended the wrecks of hundreds of other vessels. They rose into empyrean spaces. Many had been dismantled by Teferi's phoenix flocks. Others had met more mundane ends.

A cruiser halfway out of the portal flipped violently over. It veered, crashing into a nearby plague ship. Beyond them, another cruiser unleashed its battery of black-mana guns on a flock of angels. In the topsy-turvy field, though, the muck spattered a nearby squadron of dagger-ships. They cascaded into the sky. Even plague spores, even the dead, did not fall toward the ground.

"It's interesting what difference a single inversion can make," Teferi noted blandly. He cocked an eye at Urza. "It's a benefit of having a sense of humor-I'm used to thinking of what things look like when they're flipped over. Funny, mostly. In this case, flipping stuff over makes it look really lovely." He gazed at the cyclone of wrecked ships heading skyward.

Barrin sighed. "I think he's right-"

"I have a sense of humor," Urza interrupted testily.

"No, not about that," Barrin soothed. "I think he's right that he doesn't need us-"

"That's not what I said," Teferi broke in. "It's a simple spell, but a draining one. Eventually one of those ships will crash on Zhalfir and contaminate it. I need your help to shut down the portal."

"At last-reason!" fumed Urza Planeswalker.

"What do you suggest?" Barrin asked.

"It's a simple enough principle. We planeswalk into the portal-"

"Won't work," Urza growled. "Rath is warded against us."

"We don't planeswalk to Rath. We planeswalk into the portal and then back out again. We repeat the process until the spatial-temporal fluxes melt the thing down."

"The backlash will kill us," Urza said. "It'll kill us and everything in a hundred-mile radius."

"I've worked out a spell to draw off the energies. A most impressive spell. I can personally vouch for the safety of my people. Oh, and you'll survive too, Urza."

"I thought you said you needed me for this operation?" Barrin reminded him.

Teferi's smile was the brightest so far. "I need you to shame him into it."

Eyes blazing and face as red as a campfire, Urza barked, "Let's 'walk, pupil."

The two planeswalkers traded looks. Something of Urza's solemnity entered Teferi's features, and something of Teferi's cockiness infused Urza. Abruptly, they were both gone. Only the dry weeds remained. The pair flashed again into being, and simultaneously out. It was as though they were mere boys, racing for the water hole. A capricious light shone in their eyes when next they appeared.

Above, Barrin could see why. The portal seemed to be boiling. The energies in that black space crisscrossed and reversed, warring against each other. Surges of black energy tore into coils of red power. White sparks and blue-green shafts of force battled for predominance. Grinding teeth of magic chewed an emerging cruiser to shreds. It belched smoke downward and rained ruin up.

Faster they flashed, and faster. Their grins only deepened.

Barrin shook his head, smiling also.

A light awoke-a blinding thing. A new sun was born above Dominaria. It flashed, casting the fleet's shadows on the plains below. Whatever ship still labored in air ceased its struggles, plunging upward like ash on the heat of a fire.

Barrin winced back. The whole hillside and all Zhalfir could be consumed by that sudden blaze.

Then, it was done. Neither blinding fire nor black portal shone in the sky. Neither Phyrexian fleet nor phoenix flocks circled there. The sorcerers of the Zhalfir Mage Corps stood on the plain, eyes lifted heavenward and hands applauding. It was as though they had just watched a fireworks show.

"What happened?" Barrin wondered aloud.

"Come," said Teferi simply, appearing out of nowhere to grasp Barrin's arm and drag him away in a spontaneous planeswalk.

The world folded around Barrin, spinning into chaos. As quickly as Zhalfir had flashed away, it returned, though now a mile below. Barrin floated in blue skies beside Urza Planeswalker and Teferi of Zhalfir.

"Very impressive," Barrin rasped. "Very, very impressive."

"Where did you put the energy?" Urza asked suspiciously.

Teferi shrugged. "I put it away for another spell."

Urza cleared his throat-exactly the sound he had made as Teferi's headmaster. "Well, now that we have helped you save Zhalfir, you must help us save the world."