As the name implies, this deck is built around Jarad, and uses his ability to sacrifice creatures and deal damage to all opponents equal to the sacrificed creature's strength.
The idea is to use the scavenge mechanic, Death's Presence, and Phytoburst to beef up your creature's strength, then sac the creatures to damage opponents.
Main characters:
Jarad, Golgari Lich Lord: He's the centerpiece. This deck is built around his mana ability.
Corpsejack Menace: doubles the number of +1/+1 counters on your creatures from any source. He'll be making scavenge and Death's Presence really work for you.
Varolz the Scar Striped: Makes all creatures in your graveyard scavenge for their mana cost. Allows you to scavenge more economically and really put counters out.
Lotleth Troll: Your main blocker with 1b regenrate. You can discard cards with scavenge (slitherhead) to put counters on the troll, then scavenge to boost him more. Once he hits ten, blow him up.
Supporting cast:
Daggerdrome Imp: Flying with Lifelink. Cheap target for counters, and adds to your life.
Crowned Ceratok: He's a big beastie that gives your creatures with counters Trample.
Dreg Mangler: Haste and Scavenge bg3
Sewer Shambler: Scavenge b2
Sluiceway Scorpion: Deathtouch and Scavenge bg1
Slitherhead: Scavenges for 0
Enchantments:
Death's Presence: Lets you add the power of creatures that die to other creatures you control, permanently.
Sorceries:
Phytoburst: Beefs up creatures for attack, defense, or sacrifice
Treasured Find: For getting whatever you want back from your graveyard. Most likely to get Putrify or Phytoburst.
Instants:
Crypt Incursion: Boosts your life, and exiles creatures from your opponent's graveyard. You know, in case he's playing scavenge too.
Putrify: Removes pesky artifacts and creatures. As a bonus, they can't be regenerated.
Your objective is to get Jarad, Corpsejack, and Death's Presence, on the table, along with some other creatures. Sac 1 creature, add it's power to the next + scavenge, then sac creature 2, rinse and repeat. This may take successive turns.
For example, the above named are on the battlefield with a Dreg Mangler, Crowned Ceratok, and Sewer Shambler.
a. Sac Sewer Shambler for 2 damage to all opponents. Using Death's Presence and Corpsejack, add +4/+4 to the Dreg Mangler. Scavenge the Shambler onto the Mangler, adding another +4/+4. Dreg Mangler is now 11/11.
b. Sac Dreg Mangler for 11 damage to all opponents (13 total so far). Add +22/+22 to the Ceratok, scavenge the Mangler for another +6/+6, Making the Ceratok 32/31.
c. ... you get the idea.