Now

Goal of the deck is to use Altar of the Brood, Retraction Helix/Banishing Knack, Zephyr Scribe/Mirran Spy/Battered Golem, and a 0cmc artifact. This creates an infinite loop so you cast the artifact infinite times to mill your opponent. I like this deck over the top post on /r/budget decks because its modern, mono colored, and it has more redundancy from transmute and 8 good dig spells.

The Zephyr Scribe makes the deck a tad more consistent. There are a variety of 0cmc artifacts to choose from that have uses outside the combo. Dizzy Spell can get you Altar or a bounce spell. Bounce spells can also be removal in a pinch

The Good:Can be done in Mono-Blue, has plenty of transmute to find the pieces you need, and can kill on turn 4. When goldfishing, it wins turn 5 like 80% of the time. It is also very versatile, you can swap out cards for a light control shell, and you can splash red for the storm kill if you like.

The Bad:It requires 4 combo pieces to do, so it falls apart to BGx or U-control variants.The budget options means you can't use fetchlands to thin out your deck, or use useful 0 mana artifacts like Mishra's Bauble or Mox opal.

The sideboard:

Spell pierce and Negate protect our combo or slow down other combo decks.

Elixir and Singing Bell Strike to save us from the burn or aggro decks (elixir is tutor-able)

Perilous Research helps us in the long game against control decks

On MTGO i recommend you use darksteel relic and herbal poultice to save time