You could tell by looking at them that the two duelists were not beginners and were taking their battle far too seriously to waste time cracking jokes....
Jon led off the duel by playing , and had nothing further for his turn. Kai responded by playing  on his turn and passed.
In his second turn, Jon played  and tapped out to cast . Jon tried to end his turn but Kai cast  in his end step. Jon discarded , the best fatty ever printed, with just a hint of a smile. On his turn, Kai responded by playing  and tapping out to produce two mana to cast . Having nothing further, he let Jon go again.
Jon began by attacking with , which  could not block because of 's protection ability. Jon then put  into play. He tapped  to activate  and tapped  to cast  with three +1/+1 counters. Contemplating using  during his attack, Kai played . Then he attacked with . Jon sensed a trick and let it through. Indeed,  would have let Kai kill  and get damage through anyway. Kai then tapped out, taking a point of damage, and since he had done damage this turn he was able to cast  without having to sacrifice it. Then he let Jon go.
Jon attacked with both his creatures, and Kai still couldn't profitably block. Jon cast  face down and put  into play tapped. On Kai's fourth turn, he just cast the  he just drew and held back his creatures.
Jon untapped, drew his card and thought for a bit, eventually deciding to attack with  and . Kai was ready, quickly blocking  with  and  with .  got +1/+1 when blocked, but that was not going to be nearly enough. Kai tapped  (taking another point) and  to cast the  he'd represented targeting . Now  was easily big enough to kill  and survive. Then, he tapped  and  and sacced  to cast  targeting Jon. It resolved and  got five +1/+1 counters. Jon could only let both his creatures die while Kai's lived. After combat though, he cast  at  to finish it off (tapping  and ). Kai let out a sigh but even if he had held  back to protect ,  would still have done just enough damage.  came into play tapped, and it was Kai's turn. Kai played  and cast  (tapping all his lands, taking another point) to destroy , hoping that shutting down 's ability to produce colored mana, especially reusable red mana, would cause Jon problems .  also happened to be the only target in either deck that would let Kai gain a life upon resolution of that spell.  attacked for the second time and then Kai passed the turn.
Seeing no blockers, Jon attacked with . Kai tapped  and cast  destroying it. If Jon had had a white source other than  he would have been able to flip  over and save it. Kai was relieved to have dealt with the potential flyer before it started causing trouble. Jon decided to just play  tapped and be done. On Kai's turn he just attacked for two with  again and was done.
Jon drew for his turn. Looking to shake things up, he cast the  he topdecked by saccing  and using one of the mana to activate . Jon discarded , and frowned when he saw Kai discard . Both players drew up to seven and Kai tapped , , and  to cast . Jon played  and passed the turn. Kai attacked with both his creatures. Jon tapped , , and  (taking a point) to cast  targeting . It resolved, killing  and letting Jon draw a card.  got through unmolested though. After combat, Kai played  and tapped  and (taking a point) to cast .
On Jon's next turn, he put  into play tapped. He quickly counted the cards in his graveyard and then he tapped  to activate , and tapped  and  to cast  threatening to kill all of Kai's creatures. Kai also looked over his graveyard, and then he tapped  and  to cast  targeting  removing  and  from the game. In response to his own spell, he activated  targeting . When the dust settled  destroyed  (which was destined to die anyway), but  was now a point shy of sending  to the graveyard. Kai sent  to attack unhindered next turn. Then he played  and tapped it,  (for colorless), , and  to cast  at Jon. It would have been just enough damage to kill him, but Jon was able to cast  pitching  to counter it, taking a point but staying alive.
Jon untapped and tapped  to activate . He used one of the mana to cast  targeting himself to draw three cards. Jon was now able to remove the immediate threat. Using the other mana in his pool Jon sacced  targeting . Then he cast  at  by tapping  and . He even gained 2 life in the process. Jon then played  tapped and was done. Kai played  and tapped it to cast , and tapped ,  (hurting himself yet again), , and  to cast . If either got through unblocked it would be just enough to finish Jon with the help of . To further cut Jon's options, Kai sacced  to destroy , eliminating a blocker that could have gotten in the way of  even if it used its evasion ability.
But Jon still had answers. He untapped and played . He then tapped  (removing a counter) and activated  to cast  (leaving one mana floating), and then tapped , , and  to cast . Immediately upon 's resolution, 420.5e triggered sending  and  to the graveyard. On Kai's next turn he went for the win again. He tapped  to use 's ability, leaving  unable to block it. Once that resolved,  attacked, and Kai tried to activate  targeting  after blockers. After that, Kai had been planning to tap  and  to use  also targeting . In response to the activation of , Jon tapped  to cast  targeting  though. Thus,  was destroyed before the resolution of 's ability made 's drawback lethal. All Kai could do instead was tap  (another point) to cast a wall, , which was looking rather useless.
And on the next turn, Jon finally peeled the  off the top of his deck that he'd been waiting for. He tapped , causing him to sacrifice it, and activated  to cast  enchanting the long-forgotten , bringing it into play. He played , a dual land, and tapped it and used the other mana that was floating in his pool to cast  to return  to his hand.  then attacked and got through since it had protection from 's color. The game slipping from his hands, Kai tried to cast  tapping  and . If it resolved it would have done 10 damage to Jon and 8 to Kai. Jon was not about to take the draw though. Instead, he tapped , sacrificing it, and tapped  and  to cast , which countered . That was all Kai could do, and the end was near.
On his turn, Jon tapped four lands ( activating , , and ) to cast  enchanting . He then attacked with all five of his creatures. Even blocking optimally, Kai took just enough damage to die.