The only infinite combo I know of in Standard. Pretty self-explanatory. Elite Arcanist onboard with an exiled Triton Tactics and a Zhur-Taa Druid. Tap Druid for mana, tap Arcanist to cast Tactics, untap both, repeat, win. I've decided to go with a balls-to-the-wall ultra-greedy list that runs four colors. I'm sure the straight RUG list will be more consistent, but I think this offers us a bit more flexibility and resilience.

Now let's get into the card choices.

Our 3 combo pieces are obviously an automatic 4-of. These are the cards we always want in our hand.

Cyclonic Rift: easily shuts down most aggro decks, and the Overload isn't too much of a stretch for this deck. Hammer of Purphoros is a good card against control, plus (assuming we have all combo pieces in hand) it allows for a turn-4 win.

Simic Charm is just great. We're probably not going to be using the +3/+3 mode, but the other two modes protect our guys from spot removal and can be used as an Unsummon. It's a great tempo card in this respect, and what's really nifty with Elite Arcanist is that you can cast him with something exiled, Simic Charm him back to your hand, and recast him with something else. Sounds pretty neat huh?

Syncopate: C'mon. Really obvious.

Izzet Charm: It's a shitty Mana Leak, it's a creature-only Shock, and it's an instant-speed Faithless Looting... We're mainly going to be using this card to dig up our combo, but its other modes are still quite useful.

Disperse: The other other Unsummon. It has the added benefit of working on non-land permanents and not just creatures. This means those dastardly Detention Spheres, pesky Planeswalkers, and annoying artifacts. When you cast this make sure to say GET THE FUCK OUTTA HERE

Divination: 3 mana to draw two cards? You might be saying "meh" and I'd probably agree with you. I don't feel too strongly about this, but it's probably the best we've got right now. It might be replaced by Inspiration, as we can also exile Inspiration with our Arcanists.

Boros Charm: We're probably mainly going to be using this for its indestructibility feature. Anger of the Gods and Supreme Verdict can't fucking touch our combo pieces now. FUCK YOU CONTROL! It can also be an alternate win-con with an Arcanist, allowing you to do 4 direct damage per turn for only 2 mana. WOW IMPRESSIVE

Urban Evolution: this is just a really strong card. Easily playable on turn 4... and since all of our pieces cost very little mana, that extra ramp allows us to play a piece while holding a counterspell in hand.

Sphinx's Revelation: You know it. This is the main reason why I'm being so goddamn greedy and going with a four-color deck.

23 Lands, 6 of which must enter tapped and scry 1, 10 of which are shocks. This seems okay to me, I may take the scrylands down by 1 or 2 and bump up the amount of basics. I may also up the total count to 24.

Sideboard:

Primeval Bounty: this turns any card in your deck into its own win condition. Definitely siding both of these in against anything that runs BR, because I'm terribly afraid of Slaughter Games.

Aetherize & Fog: for those uber-aggresive decks

Turn//Burn: I don't even know what this is in here for. We'll see.

And of course a suite of counterspells for every situation.

Maybeboard:

Prophet of Kruphix: She's pretty fucking insane, especially with Elite Arcanist. You can cast any instant exiled with him once on your turn AND once on their turn... Imagine Silence or Boros Charm with her out. Sweet. She might cost too much for too little, and she's very easily removable... she does let us flash in our creatures, but if she's removed the turn she's played it's a huge tempo loss for us.

Silence with Elite Arcanist just sounds fucking mean.

Inspiration might be better than Divination. It's one mana more for an instant... We'll see.

Quicken probably needs to be in here. The only sorceries to benefit from it are Urban Evolution and Divination, but drawing 1 card for 1 mana at instant speed isn't always terrible.

Dissolve: Theros's Dissipate. Cancel plus a scry. It's pretty strong, and that scry is really nice for us, as we're always pretty much looking for a specific card or two.

Clan Defiance: another alternate win-con, you can go INFINITE with Elite CARYATID Tactics instead of the Druid and just cast this puppy for a burjillion damage. For 6 mana it can also take care of a Stormbreath Dragon AND a Loxodon Smiter AND deal 4 to their fucking face AT THE SAME TIME. wow SUPER impressive.