I wanna make a Mardu Aggro Deck that contains Judith, the Scourge Diva, Hero of Precinct One, and Heroic Reinforcements.

Right now it looks like this. Any Suggestions?

//Update: 13.03.2019

Creatures:
4x Footlight Fiend
4x Hero of Precinct One
4x Imperious Oligarch
1x Pitiless Pontiff
4x Fireblade Artist
1x Midnight Reaper
4x Judith, the Scourge Diva
3x Seraph of the Scales


Non-Creatures:
2x Glass of the Guildpact
2x Unbreakable Formation
3x Mortify
4x Heroic Reinforcements
2x Conclave Tribunal


Lands:
1x Plains
2x Swamp
4x Blood Crypt
2x Dragonskull Summit
3x Clifftop Retreat
4x Isolated Chapel
4x Godless Shrine
3x Sacred Foundry

You definitely want 4x Hero. Hero into Judith into Reinforcements is a turn 4 kill.

My list is pretty much the same as the one you linked, except I run a Mortify/Bedevil split.

Updated my deck above and here are other versions I'm playing:

Mardu Divas (Bo1):

4x Footlight Fiend
4x Gutterbones
4x Priest of Forgotten Gods
4x Dusk Legion Zealot
3x Pitiless Pontiff
4x Militia Bugler
1x Midnight Reaper
3x Ministrant of Obligation
4x Judith, the Scourge Diva
2x Elenda, the Dusk Rose
3x Ravenous Chupacabra

3x Swamp
4x Godless Shrine
4x Isolated Chapel
4x Blood Crypt
2x Dragonskull Summit
3x Sacred Foundry
4x Clifftop Retreat

Mardu Aggro Clarksville (Bo3)

4x Footlight Fiend
4x Gutterbones
4x Priest of Forgotten Gods
1x Tithe Taker
4x Orzhov Enforcer (instead of Tithe Taker)
2x Legion Warboss
1x Midnight Reaper
1x Plaguecrafter
4x Seraph of the Scales
4x Judith, the Scourge Diva
2x Shalai, Voice of Plenty

2x Light Up the Stage (instead of Theater of Horrors)
1x Cast Down
3x Mortify

1x Mountain
2x Plains
3x Swamp
4x Blood Crypt
2x Clifftop Retreat
4x Dragonskull Summit
3x Godless Shrine
2x Isolated Chapel
4x Sacred Foundry

2x Hero of Precinct One
2x Consecrate // Consume
2x Kaya, Orzhov Usurper
1x Bedevil
2x Conclave Tribunal
1x Spawn of Mayhem
1x Vraska's Contempt
2x Basilica Bell-Haunt
1x Angrath, the Flame-Chained
1x Banefire