K'rrik

Kerrick (also known as K'rrik) was a Phyrexian sleeper agent on Tolaria. He crashed on the beach with his ship, and was found and rescued by a young Jhoira, who was fond of contemplating the ocean and thinking of Shiv. She longed for a strong man like the ones in her tribe of Ghitu, and unlike the immature boys who roamed the Academy's walls (like Teferi, the magical prodigy with a crush on Jhoira). And so she built a small house on the beach for her and Kerrick, unnaware that he was infact a Phyrexian sleeper agent. She sneaked from the academy to visit her secret guest, her secret lover.

One night, Karn, the silver golemn, and also Jhoira's only (true) friend, was wandering about the beach while having been sent back in time a few hours in one of Urza's (here known as Master Malzra) time-travelling experiments. He discovered Kerrick and Jhoira but promised to tell no one about them. On another such voyage to the near past, Karn discovered Kerrick stealing blueprints from Urza's lab, and so he followed him, taking advantage of the fact that he was unphased with this "past" world (a side effect of the time machine) and tat his mighty golemn steps would go unheard. He followed Kerrick through the secret passage that Jhoira used to sneak out of the Academy with, and Kerrick unknowingly led Karn into a secret Phyrexian meeting in the woods, where Karn overheard their plans of invading the Academy.

When Karn returned to the present, he quickly attempted to warn Urza, but it was to late, for the attack was already upon them. Kerrick had brought Phyrexian negators into the Academy and they began slaughtering everyone. Karn fought and smashed his way into Jhoira's room, where he found her body covered in blood in the ground, and fought and slayed her killer. After killing the negator, he returned to Urza and suggested using the machine to avoid all of this. Urza agreed and sent him back once more, even though the machine was near and overload.

Karn was successful in catching the past Kerrick, even breaking his leg in the process, but he was suddenly and forcefully pulled back into the present, where the machine overloaded and malfunctioned. Casting arcing rays of temporal energy and instantly aging parts of the lab into dust, the machine exploded and caused the great temporal disaster in Tolaria. Urza, using his planeswalker powers, quickly petrified the studants and staff closest to him (14 total, including Barrin) and 'walked away to safety.

After returning 10 years later, they found that Kerrick the sleeper agent had survived the anomaly and he, along with other phyrexians, was trapped on a fast-time rift, in which he constructed an enourmous Phyrexian fortress and army, changed his name to K'rrik and became the lord of that fortress. From inside this rift he grew his army and devised ways to attack Urza and his team, who were rebuilding the Academy.