The main engine in the deck is the creature base. Some creatures do things when they enter, others are extremely easy to cast from the hand or graveyard to keep trigger creatures doing their thing. The casting costs were carefully selected to be low but maximize the devotion wincon of Gray Merchant of Asphodel.
Cryptbreaker- A 1-drop utility creature to produce tokens. Synergies include any
Zombie in your hand, especially
Gravecrawler or before playing
Diregraf Colossus.
Gravecrawler- A recastable neusance. It dies easily, and returns easily; but that's what makes it so beneficial in conjunction with
Tragic Slip,
Altar's Reap,
Plague Belcher and
Diregraf Colossus.
Relentless Dead- A favorite agressor of mine. With the ability to recycle not only itself, but other creatures, makes it indespensible in this deck. The
menace ability makes it an ominous early game evasive aggressor.
Highborn Ghoul- not particularly synergistic, but evasive and attributes to the
Devotion mechanic of
Nykthos, Shrine to Nyx and
Gray Merchant of Asphodel.
Diregraf Colossus- The mid-late game token engine. Usually cast
after combat, this bad boy gets permanent +1/+1 counters for each zombie in your GY. Its second ability makes this a super efficient combo with
Gravecrawler; generating tokens at a persistent and annoying pace.
Geralf's Messenger- Part of the, life-stealing wincon in the deck. The
undying ability of this creature coupled with it's stronger-than-your-average-zombie power, makes this a must have switch-hitter and utility creature with cards like
Altar's Reap,
Bone Splinters and
Plague Belcher.
Death Baron- Tribal pump and board-wide
deathtouch. For 3, this guy is a great step toward winning the game.
Liliana, Death's Majesty- This
Lili is a turbo boost for late game. Spitting Zombies and reanimating from your GY, is her main deal; but, should the game go long her final ability is a boardwipe that should leave you the victor.
Liliana, the Last Hope- Mostly, graveyard feed and token generation. Her +1 ability, makes for a decent removal when coupled with
Tragic Slip.
While zombies are persistent, they obviously aren't very tough. Larger creatures and flying opponents are very troublesome for this deck, which is why the bulk of the noncreature spells and most of the sideboard are hard removal of even the largest and most troublesome of creatures.
Zombie Infestation- All game zombie production. Best with
Gravecrawler and any land draw after having 5 +
Nyx on the board.
Altar's Reap- Cheap spells often burn out a hand in the first few rounds, this card allows you to draw, in black, without losing life, and is often beneficial with cards to sac like
Geralf's Messenger,
Gravecrawler and
Relentless Dead.
Bone Splinters- Indiscriminate killing power, as long as you have a creature to sac.
Tragic Slip- Gets around nearly all huge
indestructible creatures (ie: Eldrazi) and has become one of my personal favorite one-cost removal spells.
Ghoulcaller's Chant- Need a zombie or two? Spend just
and get up to two creatures back from your graveyard to your hand to beat your opponent over the head with. Works well with
Zombie Infestation or
Diregraf Colossus on the board. It's also useful for getting back
Gray Merchant of Asphodel and
Geralf's Messenger for more abuse of their abilities.