MUD is a deck i like so much in legacy, but it isnt in my reach. Then i start to think some way to play same line in modern and surprise the opponent. We still have access at good pieces play both Legacy and Modern. We dont have acess to the Sol Lands, then the fast way to make mana in modern is transform it in Urza land'sand, we cant use Wastelands, then we can use the Tectonic Edge Encroaching Wastes and Ghost Quarter's package.
We can use Chalice of the Void to have protection, Trinisphere and Lodestone Golem to slow the opponent. We can use Mind Stone and Everflowing Chalice - or other mana rock as Mox Opal for exemple, its importante have an 0 CMC and will explain why later - as Ramp/Mana redundancy for not to depend Tron online 100% all time.
Here we have some angle of attack/interactions in deck:
Kuldotha Forgemaster + Lightning Greaves combo can win on T3 if we assemble tron and have some 0 CMC artifact to cast it in this turn to serve as food to forgemaster: cast Kuldotha, Greaves + some 0 artifact, sacrifice all minus Greaves get Blightsteel Colossus from deck equip and beat. (depends on the match, Chalice of the void as 1 is very importante to not got a Path of exile on Colossus.
Trading Post + Spine of ish Sah can start devastate Lands or Creatures of a slow decks. Spine give us some advance in mirror against tron, especially if we get tron on T3 and cast Spine.
Attack the manabase. ALL MANA. This give us more effective use of the ramp pieces (Mind Stone + Everflowing Chalice) and consequently make Lodestone Golem more powerful.
Chalice of the Void: Not much to say. Chalice can protect us from many forms. Many decks on modern tend to play in one same curve. Chalice can "kill" half of some deck, giving us time. [3~4]Walking Ballista: Can grow every turn, can enter big, can kill small creatures and we can make much mana. Dont have why to no put ballista in list. [1~2]
Expedition Map: The must for all Tron bases. Can get too our Land Destruction lands. 
Lightning Greaves: Enables win in a turn with Blightsteel Colossus. Protect our creatures and give haste, so powerful. [1~2]
Mind Stone: Our ramp redundance for not depend 100% on tron on-line to make plays. 
Ichor Wellspring: Its just a draw and food for Kuldotha Forgemaster and sinergie well with Trading Post. [3~4]
Crucible of Worlds: Important part in the LD package and against LD. 
Filigree Familiar: Life and card advantage. its a good creature to give us time. [3~4]
Lodestone Golem: Tax and beater piece. Each attack hurts. 
Trading Post: Our Swiss Army Knife. Can gain life, trade 1 life for an chumpblock, recovery our creatures (can make infinites Wurmcoil Engine sacing one then an token. Best sinergie with Spine of Ish Sah. [1~2]
Batterskull: Good against remove, nightmare of aggros/burn. 
Kuldotha Forgemaster: The card give a name to deck in legacy. Have a good power in modern too, with Lightning Greaves can active in same turn she enter, it can do some tricks seeking some response at instant speed. Double draw with Ichor Wellspring, return Spine of Ish Sah to hand, and a good body. 
Wurmcoil Engine: We all know the power of the machine. Give all the time we need for the bigger or can win alone sometimes. 
Scuttling Doom Engine: A good beater, cant be chumpblocked and have a good sinergie with Trading Post, can do damage outside combat ou double damage (attack and sac) [1~2]
Steel Hellkite: Flier beater with an EE on body, seens good. 
Spine of Ish Sah: The "resolve anything" piece. Rly shine on mirror, can destroy Planeswalker we can beat, can destroy lands and slow opponent, its rly good. 
All is dust: Sometime we just need to reset the table. [1~2]
Platinum Angel: An not answered angel with Lightning Greaves can just autowin the game. 
Sundering Titan: Terror colored decks. Can support one strategy of the deck (LD). [1~2]
Ugin, the Spirit Dragon: Ugin can swipe the table, can control small creatures, can win the game. [2~3]
Blightsteel Colossus: Sometimes 1 attack is all we need. 
MORE INFO LOOK AT