Golgari Aristocratics (EDH / Commander)

This is a control engine deck where you seek to prevent early victories with an array of various types of removal, while you build an engine that will eventually out value your opponents from the game.

The general play pattern is to ramp early into your commander and some form of continual card draw. Ideally, you'll fetch Sidisi, Undead Vizier and start finding either engine pieces or winning combo pieces to close the game out. You'll need to use targeted removal only to prevent you from losing the game, with your split second cards being particularly valuable.

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Infinite Combinations w/ Melira, Sylvok Outcast + Putrid Goblin

These two pieces enable a lot of infinite combos depending upon the additional piece which you current have on the board. This is because of the interaction between Melira and Putrid Goblin. When the goblin dies it will persist back to the board as long as it did not have a -1/-1 counter on it and then gain a -1/-1 counter. Melira will prevent this counter from being place therefore it may die an infinite number of times and still return to the board. Please not because the trigger for the goblin to return must resolve to continue this process this is more open to removal than the Squirrel's Nest combo.

Infinite Draw: Grim Haruspex | Fecundity | Smothering Abomination + Sacrifice Outlet
Since each of these pieces draw you a card when a creature dies or is sacrificed you may draw any number of cards from your library by sacrificing the goblin continually.

Infinite Mill: Phyrexian Altar (Colored Mana) | Ashnod's Altar (Colorless)
Continually sacrifice the goblin to create as much mana as you want.

Infinite Drain: Blood Artist | Zulaport Cutthroat + Sacrifice Outlet
Continually sacrifice the goblin pinging your opponents to death.

One Sided Board Wipe: Dictate of Erebos | Butcher of Malakir
Continually sacrifice the goblin forcing your opponent to sacrifice a creature. The order of placing the triggers upon the stack is important to avoid being hurt by an opponents own Dictate, Butcher, or Grave Pact or to prevent them from preventing you from wiping their board by having something which generates a creature upon their own creature's death, like Teysa, Orzhov Scion + Darkest Hour.

Example uses Dictate of Erebos, but works the same with either Grave Pact or Butcher of Malakir
1) Sacrifice the Goblin. Order the triggers such that Dictate trigger goes on the stack first, then the trigger for the Goblin to return.
2) Allow both triggers to resolve. You will gain back your Putrid Goblin and then your opponents will be forced to sacrifice their creatures.
3) With the creature creation trigger on the stack, sacrifice Putrid Goblin ordering the triggers in the same order as before.
4) Repeat 1 - 3 until all the opponents creatures have been sacrificed
5) Allow all remaining triggers to resolve
6) Sacrifice goblin again to clear the board assuming you have removed source of the token generator

Infinite Combo: Earth Craft + Squirrel's Nest

A tried and true combo in EDH, this is the standard win condition for the deck.
1) Attach the Squirrel's Nest to a basic land.
2) Untap the land by using Earth Craft by tapping an untapped creature.
3) Tap the land to create a 1/1 Squirrel Token.
4) Repeat 2 - 3 at instant speed for infinite 1/1 squirrels

Any of the above infinite combinations may then be performed and because the squirrel's may be generated at instant speed it is far safer from removal.

Army of Squirrel's: Just make a near infinite number of squirrels and hope no one has a board wipe. Win?

Alternate Win Conditions:
If your opponents are able to remove your ability to play either of these combos there are a few creature combinations which may be used to win the game.

1) Beastmaster Ascension + Avenger of Zendikar - By recurring the Avenger a large number of small tokens are easily created. Beastmaster Ascension and then easily turn these in 5/5 attackers

2) Grismold, the Dreadsower + Avenger of Zendikar - Instead of going wide this time you can just go tall with Grismold where you sacrifice the tokens to make him large enough to one shot an opponent.

3) Mazirek, Kraul Death Priest - If trample won't work maybe the air will?