Assuming your account has unlocked all 10 free dual-color decks, this build will get you started with a heavily proxied version of a top-tier Standard deck, Golgari Midrange.
I took Maxwell Jones' 1st place list from SCG Standard Classic Dallas and swapped in free-to-play cards for the bounty of better cards he ran to great success. Here's the list of swaps:
Golgari Findbroker -> Gravedigger
Jadelight Ranger -> Deathbloom Thallid
Ravenous Chupacabra -> Dire Fleet Poisoner
Merfolk Branchwalker -> Doomed Dissenter
Assassin's Trophy -> Murder
Wildgrowth Walker -> Druid of the Cowl, Thorn Lieutenant
Seekers' Squire -> Poison-Tip Archer, Reassembling Skeleton, Kitesail Freebooter
Doom Whisperer -> Demon of Catastrophes, Twilight Prophet, Tendershoot Dryad
Find / Finality -> Vraska's Contempt, Murder, Gravedigger
Vraska, Relic Seeker -> Path of Discovery, Open the Graves, Carnage Tyrant
Vivien Reid -> Elvish Rejuvenator, Slimefoot, the Stowaway
The original cards we don’t have access to are listed in the Maybeboard.
Notice that we don’t have access to any Naturalize effects in the free pile, which means we should be prioritizing cards like Assassin's Trophy, Vivien Reid, or Vraska, Relic Seeker for our early crafting. Usually I prefer crafting mono-colored cards first, since they can be used in a wider variety of decks, but you can’t argue with the raw power level of these two Golgari cards.
Once you have crafted a decent number of the Planeswalkers, you can switch Gravedigger out for Golgari Findbroker, since the latter can grab any permanent from the graveyard, not just creatures.
Also, having the cards with explore (Jadelight Ranger, Merfolk Branchwalker, and Seekers' Squire) will make a big difference on the smoothness of the deck’s play. (Warning: don’t start with Wildgrowth Walker, or you’ll find you’re quite short on explore triggers!)
Another powerhouse is Find / Finality, which gives two extremely relevant abilities on one card. It looks a bit worse in our early build, though, as most of our creatures lack the size to come out alive on the other side. After you have crafted a good chunk of the explore cards, including some Wildgrowth Walkers, the Finality side of this card starts to seem more optimal.
If you play with the deck, I’d love to hear your feedback. Thanks for reading!
P.S. I am curious about Vicious Offering, as the original deck packs Moment of Craving in the sideboard. While our proxy doesn't have the lifegain aspect, it may still be a useful card to have access to. I'll test it.
