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Finally managed to design a wasteland variant that would work for modern tempo:

Unstable glaciers
Snow Land
T: add 1
Snow, sac, T: return target non basic lands on the top of it's owner's...

With bo1 being an actual thing now cards likes these become a possibility:

To compensate the die roll:

Reverse Octahedron 2
Artifact
T: add 1
If u have 8 cards in hand, reverse Octahedron...

A card disadvantage bauble-brainstorm would not break the color pie at all, and at 0, even with the card disadvantage it'd be played.

Brainstorm's bauble 0
Artifact
Sac: draw 2, put 2 back on...

Tsabo's Moon 2
Artifact
Activated abilities of lands that aren't mana abilities can't be played.

An alternate blood moon that hit fetches the hardest, but also is incredibly good vs...

Magus of the oath would be perfectly balanced as a 1/1 or even 2/2 for the original mana cost of oath of druids, being himself a creature:

Magus of the oath 1G
Creature - Magus
~ oath of druid...

If u want a good WR card, a super recruiter would fit nicely in both color's phylosophies:

Supah Recruitah RW
Creature - whatever
As this ETB, search your library for a creature with power or...

This gave me a great idea

Flametongue Jackal R
Creature - Hound
When ~ ETB, deal 2 damage to target creature and 2 damage to you.
2/1

It's unplayable T1 on the play, but on the draw against...

Senpai's Revealing Top 1
Artifact
When Senpai's Revealing Top get printed, ban Brainstorm in legacy and unban Sensei's Divining Top.
Divine justice.

A card to push post and tomb decks in general.

Geomimic Stone 2
Artifact
Geomimic Stone ETB tapped as a copy of target land, except it's still an artifact.

Mox Paradox :0:
Artifact
Untap : add one mana of any color to your mana pool

This could've been the mox for kaladesh. Work with the additional casting cost (improvise) and a subtheme of tapping...

Something with some side-sinergy would work methinks. Like:

Ruin and Famine 1RB
Sorcery
Destroy target land. All creatures get -1/-1 until EOT.

Basically a non-threshold rancid earth that...

Some cards to help underrepresented color combinations:

Cleansing Fire WR
Instant
Deal 3 damage to target creature or player, then exile up to three card from target graveyard.

Fire Lancer R...

The idea for the card is that they are defenses against T1 stupidity like ritual->entomb->reanimate grizzly, or T1 tendril (much rarer admittely).

Maybe 3 or more cards ended in the graveyard from...

Divine Intervention :1: :w: :w:
Instant
If a player lost 7 or more life this turn, Divine Intervention cost :0:.
Return all spells to their owner's hand. End the turn.
Too much was already lost
...

It's also something that's in a game designed by mtg players , so it's not exactly the newest idea. Same for lifelink spells.

Fiery arbiter :w: :r:
Creature - Elemental Wizard
First strike....

Repair R
Instant
Return target artifact from entered your graveyard this turn to the battlefield.

They would never unban Jar would they? Lol.

A variant:

Salvage from scraps R
Sorcery

Search for Scraps :1: :r:
Sorcery
Put the top five cards of your library into your graveyard, then return the lowest cmc artifact card from your graveyard to your hand.

If tied u choose obv. ...

I had some more cards but the internet ate my post!

Inspired by Madness :1: :r:
Enchantment
:r: , discard a card: draw a card

A red compulsion variant, since the effect is red too now....

Some alternate costing spells to promote mono-colors:

Blast Away 1RR
Instant
Deal 4 damage to target creature or player.
You may discard a basic mountain from your hand instead of paying Blast...

Absorption Sphere X
Artifact
Absorption Sphere ETB with X charge counters on it
Whenever a player play a spell with CMC X, counter it and remove a charge counter from Absorption Sphere. If you...

Just had an illumination on a cycle of standard printable, legacy viable alternative to dual lands:

Second Taiga
Land - Forest Mountain
You can't play this land on your first turn.

Ta-da,...

Situationally better duals RB version
Land
T: add R or B to your mana pool. Each player lose 1 life.

Situationally better duals WG version: Horizon Canopy

Situationally better dual , RG...

Explorer's Bauble :0:
Artifact
T, sacrifice explorer's bauble: look at the top card of your library. You may reveal it and put it on the bottom of your library if it's not a land. At the beginning...

This card do nothing in legacy!

Volcanic Insight :1: :r:
Instant
As an additional cost to play Volcanic Insight, return target basic mountain you control to its owner's hand.
Draw 2 cards.
...

City of allies
Land
If city of allies would ETB, return a land you control to its owner's hand instead. If you do, put City of allies on the battlefield, if you don't, sacrifice city of allies...