It was a four-man commander game. I was one of the slower progressing players at the time, and the undeniable target at the table was the
Omnath, Locus of Rage, across from me, with at the time 3 of its elemental tokens, a
Pathbreaker Ibex and Thundering Baloth. He attempted to cast an enchantment to, if I recall, give his creatures double strike. I had an untapped
Temple Bell and
Clock of Omens, with enough mana and artifacts to use and copy the bell up to 3 times, so I look to the
Kruphix, God of Horizons player beside Omnath, and ask what the chances are he'll draw countermagic if I give everyone some draws. He responds with pretty well, so I start off with giving us all two cards, and as predicted, Kruphix is able to counter the enchantment, and the
Meren of Clan Nel Toth to my right casts a victimize to kill the Ibex and Baloths, also saccing
Spore Frog.
Not over yet, though. He passes, though no one really accomplishes anything. Once more it's Omnath's turn, and at this point I have Kurkesh, Onakke Ancient, Temple Bell, Slobad, Goblin Tinkerer, Myr Battlesphere with all 4 tokens, Krark-Clan Ironworks, Clock of Omens, and Planar Portal. He attacks me with everything and casts a spell to give his creatures double strike, and get another combat step after this one. No countermagic this time, I have no choice but to start saccing things off to Slobad, choosing a Myr and the Clock to give a Myr and the Battlesphere indestructible. He kills the battlesphere before it resolves, but I'm able to end up with 19, though losing all but one Myr Token. Next combat, he only sends one at me, which I feel I have to block with Slobad. After his turn, he claims he didn't want to kick a man while he's down, but as I look at my mana, I realize that as long as Kurkesh and Planar Portal stay, with the amount of mana I have, I can win next turn.
Kruphix seems to be worried about this too, however believes that Kark-Clan Ironworks is the key to getting the mana I need to do so, and destroys it. Meren does nothing overly relevant, so it's my turn.
I activate the Portal and copy it to get Gilded Lotus and Voltaic Key, casting them both, and by tapping the lotus, then activating the key, with one copy targeting itself and the other targeting the lotus, I generate 700,000,000 mana and untap the Portal. Then I search and cast Decimator Web.
As I predicted, I can win this turn. However, earlier Kruphix had been complaining about the last game he played, in which he allowed a player to get infinite mana early in the game, curious what he'd use it for, but was disappointed that it was just a Comet Storm. So I decide I will not win this turn.
Instead, I use the Decimator Web to kill Omnath for because, then search Mycosynth Golem, Shimmer Myr, Darksteel Reactor, and Darksteel Forge, cast them, and pass, declaring I will do nothing offensive for the remainder of the game, but if you try to stop me or the Darksteel Reactor, I will search for and cast an artifact at instant speed to answer it, or, if I don't have one, kill you outright. Thus the puzzle begins.
Several turns pass as the reactor ticks up, neither is able to do much. They try to play permanents to break up my lock, but I search cards such as Lux Cannon, Myr Turbine, and Steel Hellkite to keep them under control. After about five turns, Meren attempts to cast a Living Death. Looking back on it, I could have survived it well enough, but I didn't want to risk anything shady happening that I couldn't forsee, so I Web him to death.
Just me and Kruphix now, perfect. This show was for him anyway.
Once more I simply pass my turn after ticking the reactor up. Kruphix, as evidence by his actions, more or less decides to try to test his limits. At this point, I am more or less a god within the game, as he understands all of the cards and effects I have at my disposal. I need only say "I'll destroy that," or "I'll make this many tokens," and it would be so. I let him draw and cast a number of spells including Vedalken Orrery that don't bother me, even letting him keep a Jin-Gitaxias, Core Augur on board for several turns.
Finally, he pulls out his Cyclonic Rift. Alright, that's enough of that, time to die. 10 Decimator Webs on the stack against him now, but it's not over yet. He continues to cast spells and activate abilities to draw cards, looking for more answers. He has very few cards left in his library now, and when he casts a Mystic Confluence set to draw 3, with an Alhammarret's Archive and Thought Reflection in play, I know he's going for a Laboratory Maniac. Again, in hindsight I could have killed the maniac once he played it, but I didn't want him to invest too many resources on a false victory. I Lux Cannon away his Archive and Reflections. He thinks for a moment and almost casts another spell - keep in mind, his death is on the stack, so if he can't win, he needs a Stifle to not lose. However, he concedes.
I'd built an unsolvable puzzle for him, and by attempting to solve it, he only hastened his failure.