Summon magical ponies from another dimension.
Straight to the point->
D.D. unicorns main focus is to use the summoning power of dark desertapir to swarm the field with beasts. Another core card to the deck is D.D Unicorn knight. While being able to use d.d gate and future visions this deck has incredible swarm potential as well.
Well now let's talk about some good cards to include in the deck:

Dark desertapir:

When dark desertapir is removed from play you can special summon 1 lvl 4 or lower beast from your graveyard... Did i mention gold sarcophagus triggers it also? It doesn't matter where, as long as he's banished you get a free summon.
This card is absolutely amazing. It's one of the core cards and should be run at 3. As the great picture suggests, this card works amazingly well with unicorn beacon.

Unicorn Beacon:


Special summon 1 removed from play level 5 or lower beast from your banished zone, then banish one card in your hand.

Summon a d-prison'd naturia beast, banish a dark desertapir for another free summon. This card is great but can end up dead in the begining of the duel and requires a bit of setup. I suggest 1-3 depending on how many banish recycle cards you run.

D.D Unicorn knight:

This card cannot be Normal Summoned or Set. This card can only be Special Summoned if your opponent controls a monster(s) and you control a face-up Tuner monster(s). When this card is Special Summoned this way, you can select 1 of your removed from play Level 3 or lower non-Tuner monsters and Special Summon it. Its effect(s) are negated. You cannot Normal Summon or Set the turn you Special Summon this card.

This card is another core card which should be run at 3. A really usefull combo with this card is to banish a dark desertapir with d.d sprite. You get a tuner on the field and you can very easily recyle dark desertapir. This guy has gotten me some really epic comebacks. I mean he's an instant synchro, whats more to love?

Super-nimble megahamster:

This guy... he can bring out ryko, mine mole, dark desertapir and many other good cards for this deck. Always run 3 (Unless you feel that giant rat is better)

Now that we have the core cards lets talk about some amazing support (No pictures)
D.D. Reincarnation:
Recycles banished monsters, dumps desert targets. Again depends on how many recycle cards you run.
Royal Decree:
Do you really need traps for this?
Future visions:
If you got a dead desert in ya hand this is a good boost + it's a great stun card.
Gold Sarcophagus:
Sarco is a decent search card as it is but it doubles as a monster reborn in this deck (banish dark desert)
Necroface:
Future visions->necroface = Recycle and reuse in 1 shot
Gold sarco -> necroface = Try your luck, kill an opponents deck. (Sorry dw's~)
This card is like the backup dark desert and i recommend it in almost any build.
Beast rising:
For a beatdown variant and can dump a desert.
Beast rage:
If your running necroface then this will
build up really fast.
Chain dog:
This card should be run at 2 max, and thaats only if your deck focus's more on the graveyard. If you can get chain dog into play he's amazing but he's dead anywhere else.
x-saber airbellum:
Lvl 3 beast tuner, target for almost every card in this deck + his effect ain't too bad either.
mine-mole:
Every deck needs a draw engine, Even something as badass as unicorns from another dimension. He's also a great stall card for slow-otk builds.
Naturia synchros:
No explenation needed, don't be stupid ._.
Egotistical ape:
Level modifying beast tuner. Doesn't need a normal summon so he's good with unicorn knight also.
Monocerus:
Ez summon for d.d unicorn knight + recycles. I recommend 2-3.
Elephun:
Most consistent lvl 2 tuner in this deck, so much recycling power.
Lock Cat, Chain Dog, Key mouse all work in this deck fine and are highly recommended for grave based decks.
DO NOT RUN:
unihorned familiar:
Slow and has absolutely no use
Bazoo The soul eater among other cards your thinking of >_>
Yellow Baboon archer also miss's timing

Basic Support like ROTA for unicorn knight and return from a different dimension should be easy enough to add on your on. Don't take this list as what must be run nor look at is as the only cards you can run.

Aside from that your free to do your own experiments with this deck. The deck is EXTREMELY flexible and has many playstyles. Find what you like best and work to perfect it. Enjoy your magical Ponies
Btw, Dark deserter is abreviated D.D. I c wut u did thar
Good examples:

Considering you made the deck

https://i.imgur.com/UlIIX.png <- any tips?

U don't really need 2 d.d reincarnations if you got 3 beacons. You could replace with a mole or monocer. Also, cat isn't good if your not running other lvl 1's.
Step 1:

Force agents to scoop, That was such a great comeback.

Lolz i thought he was gunna do a hyerpion after that 8D avenge the one i toppled :3

well it is a very good deck relinquished not as great as my decks though but still not any less amazing.

What's the success rate of this deck?

You'll never know till ya give it a shot? It took me like 5 games to get a good build, key was 3-0 from the start p_p It's all a matter of how you play the deck.

4-0 nao e.e i schooled my friend...but didnt get one gate T-T ima run 3 nao e.e

That's pretty good, what card do you mean by gate?

Different dimension gate, banishes 1 monster on both side of the field. good against xyz/synchro and ban'ing desert/necro or just adding targets for unicorn knight.

It really puts the deck together, I thought running 2 would be good, nao I see I need 3 p_p....