Couple huge problems with the deck.
It's got 12 lands. A control deck needs 24-26 lands to be effective. I hope this is just a constructional transitional phase of the deck and not the actual plan for the manabase.
It's 4 colors. A 4 color deck can work, BUT, you have to have a completely divers mana base. You have to have a very specific plan for why you need the 4th color. YOU need to decide which color to drop.
Honestly copying a ling is a bad idea. You can't use one of it's most powerful abilities which is the exile ability. If you exile a token, poof, it's gone, and if you exile the mimic you have to copy something else again when it comes back into play.
Note on some of the cards in the deck. you can probably cut all/most of these.
Electrickery - only good as a sideboard card against token decks and some aggro decks.
Dispel - sideboard card against control decks
Smite - situationally good, but requires a defense creature base to work, not good in this deck
Spell Rupture - situationally good, only works in a deck where your creatures can have a healthy power, Bant hexproof is an example.
Annihilating Fire - searing spear, and pillar are better options for now.
Riot Control - you don't need to fog, you need to remove the creatures from the board, either by bouncing them or destroying them
Essence Backlash - kind of expensive for the effect, dissipate and syncopate are the counters you want to run. Perhaps essence scatter or negate depending on what you face.
Clan Defiance - mizzium is just so much better right now.
Urban Burgeoning - uhh... why?
Runner's Bane - see, riot control
Inaction Injunction - it stalls, it draws a card... I'd rather have think twice.
Verdant Haven - if you go green, this is not the ramp you want to run, if you go green you want elves, both arbor and pilgrim, or farseek.
Thespian's Stage, transguild promenade - <obi-wan kenobi> these are not the lands you're looking for </obi-wan kenobi> , you would rather run gates and basic lands over these, and a lot more of them.
taking the lists I gave you below that was more mid-rangy here's some substitution options if you're on a budget.
Creatures (3)
1 Aetherling
2 Snapcaster Mage - auger of bolas
Planeswalkers (2) - no subs here
1 Jace, Architect of Thought
1 Tamiyo, the Moon Sage
Lands (26) - gates > basic lands
1 Island
1 Plains
3 Clifftop Retreat
1 Desolate Lighthouse
4 Glacial Fortress
4 Hallowed Fountain
4 Sacred Foundry
4 Steam Vents
4 Sulfur Falls
Spells (29)
1 Assemble the Legion - not an expensive card, no reason not to trade for it
1 Detention Sphere - 5 bucks, not too bad to get. oblivian ring can sub here.
3 Azorius Charm - uncommon/common, no reason not to get em
2 Dissipate - uncommon/common, no reason not to get em
1 Essence Scatter - uncommon/common, no reason not to get em
2 Searing Spear - uncommon/common, no reason not to get em
4 Sphinx's Revelation - no real substitute here, sphinx's is in a class of it's own
1 Syncopate - uncommon/common, no reason not to get em
3 Think Twice - uncommon/common, no reason not to get em
2 Turn - uncommon/common, no reason not to get em
2 Warleader's Helix - uncommon/common, no reason not to get em
1 Mizzium Mortars
2 Pillar of Flame - uncommon/common, no reason not to get em
3 Supreme Verdict - no real substitute here either.
1 Terminus - no real substitute here either.
Sideboard
1 Aetherling
3 Clone
1 Oblivion Ring
2 Negate
2 Renounce the Guilds
1 Turn
1 Jace, Memory Adept
2 Pillar of Flame
2 Terminus
Creatures (10)
2 Snapcaster Mage - Auger of Bolas
2 Ætherling - better than the mimics trade for em if you can
4 Boros Reckoner
1 Angel of Serenity
1 Aurelia The Warleader - something big and scary, with wings?, assemble the legion perhaps
Planeswalkers (3) - no subs here
1 Ral Zarek
1 Jace, Architect of Thought
1 Tamyio, the Moon Sage
Lands (25) - gates > basiclands
2 Cavern of Soul's
3 Clifftop Retreat
4 Glacial Fortress
4 Hallowed Fountain
3 Sacred Foundry
1 Slayers' Stronghold
4 Steam Vents
4 Sulfur Falls
Spells (22)
3 Azorius Charm - uncommon/common, no reason not to get em
1 Dissipate - uncommon/common, no reason not to get em
2 Searing Spear - uncommon/common, no reason not to get em
2 Sphinx's Revelation - no substitute here.
1 Syncopate - uncommon/common, no reason not to get em
3 Turn//burn - uncommon/common, no reason not to get em
2 Warleader's Helix - uncommon/common, no reason not to get em
2 Mizzium Mortars
2 Pillar of Flame - uncommon/common, no reason not to get em
2 Think Twice - uncommon/common, no reason not to get em
Sideboard
2 Clone
3 Izzet Staticaster
1 Counterflux
1 Dispel
2 Negate
2 Purify the Grave
2 Pillar of Flame
2 Supreme Verdict