I love the big payoff. Like tonight, when I put my first charge counter on Brain in a Jar, Casting Essence Flux, flickering (one of) my Torrential Gearhulks, countering a creature with Broken Concentration, charging my 4 Dynavolt Towers. This brought me up to 37 energy.

My thanks to Saheeli's Artistry and Jace, Telepath Unbound for making this night possible.

What were you playing against?

Trying to imagine this game like

Playing against the AI with my pet blue deck. It is not a great deck for the ladder, but kicks ass on 2HG. I was just holding even against the AI, having drawn almost no creatures. At one point, I got Saheeli's Artistry and copied one of my 2 Dynavolt Towers and the opponent's 4/4 Trueheart Twins (which ended up being chumped to an 8/4 exerted Trueheart. I then got my bluehulk and blocked another Trueheart the following round, recasting Glimmer of Genius. Next turn I got baby Jace flipped, did his -3, cast Saheeli's from the GY, copying my bluehulk and another tower, with the bluehulk copying another Glimmer, I think.

Got me a Brain in a Jar, leaving me with one Aether Hub untapped, with Essence Flux in hand.
My opponent went to play a creatire on his turn,
I used the jar to cast the flux,
i used the flux to flicker the hulk,
I flickered the hulk to cast Broken Concentration, which charged my four towers, leaving the opponent with a 2/2 zombie token, me with two bluehulks, four towers, and 37 energy.

I did not durdle, but managed the swing in a short span of turns. (The AI was running a black/red minotaurs and zombies deck.)

How about you guys? What kind of ridiculous, improbable combos have you pulled off? (Like the time I had two Tireless trackers, three Erdwahl Illuminators, and two or three Reckless Fireweavers in play, so I could burn face just by playing land.)

Few days ago i cast Eldritch Evolution saccing Treasure Keeper, it reveals another Eldritch Evolution that i cast saccing Filigree Familiar.
So i draw a card, get Kalitas from second evolution, get black hulk from first evolution, exile his creature and get a zombie for 3 mana.

Today I had 3x Reckless Fireweaver , Saheeli Rai , Throne of the God-Pharaoh and Smuggler's Copter
played Maverick Thopterist and copied it, then tapped everything to crew copter (including itself) for a total of 25 damage

Opponent still on full life. Have 8/8 Green Gearhulk and Battlefront Krushok on the battlefield. Have a Heart-Flinger Manticore in hand. I draw a Giant Spectacle so I play a land and aura the Gearhulk. I attack with my now unblockable Gearhulk and then post-battle fling it at my opponent with the Manticore for lethal.

I once had a Niblis of Frost against an opponent that had quite an advanced board state and was threatening lethal next turn. In hand I had a Harnessed Lightning and two Dispel. After a bit of thinking, I cast the Harnessed Lightning on one of their creatures, then Displelled it, and then Dispelled the Dispel, tapping out three of their creatures and swinging in for 6 flying. They were on 6 life.
Fun.

Where did you get the zombie from ? You didn't kill any of your opponents creatures, you exiled one which doesn't trigger Khalitas ability.

Noxious Gearhulk. It destroys but Kalitas's ability sends it to exile.

Ah, right - I haven't used the Gearhulk in a long while. More autocarding!

Trivial, but satisfying nonetheless - Turn 2: Mage Ring Bully. Turn 3: three copies of Titan's Strength.

FOR MASSIVE DAMAGE.

Playing Rakdos Hellbent vs a high quality Bant Midrange deck. Opp able to disrupt my tempo enough to take it to later game. I have a wide board and a land in hand. Discard land to make Bomat Courier unblockable with Key to the City and swing with the team. Opp down to 1 life. I'm dead on the backswing. Courier's got 6 cards under him, so I sac hoping for reach. 2 of the 6 cards are Alms of the Vein - cast one for lethal, with enough mana up for the 2nd if 1st gets eaten by a Spellqueller. GG.

Another game with Rakdos Hellbent. Playing an Orzhov Midrange deck. I have a Smuggler's Copter out, but had to cast my last spell in hand for a creature to crew the Copter. Opp at 6 life, but had just cast Kalitas, Traitor of Ghet who's lifelink would be turning the game around in opps favor. I attack with Copter and use filter ability and a prayer to the RNG gods - draw Fiery Temper, pay madness for 3 to the face, and Copter deals lethal.