odric the zombie (Standard)

Aim:
A tempo driven deck, which uses the un-killable nature of zombies to gain card advantage in conjunction with deathtouch. Utilising cheap value minions which have static abilities to secure the board and push for damage with skulk and menace.

list of Static abilities used:
menace (relentless dead)
skulk (rancid rat)
deathtouch (rancid rat & ayli, eternal pilgrim)
lifelink (kalitas, traitor of ghet & shambling vent (turn into creature before combat to gain lifelink))
indestructible (gideon, ally of zendikar +1 indestructible)
flying (drana,liberator of malakir)
first strike (drana, liberator of malakir)

Card justification:
Relentless Dead:
A core component of the deck, which uses its un-killable nature to always have a creature with menace on board for Odric, it further gains advantage with Rancid rat by providing a repeat death touch minion to gain card advantage. The card further works with Diregraf Colossus to generate tokens, and acts as a unit to sacrifice for Kalitas for a +2/+2 and life gain for Ayli.
Odric, Lunarch Marshal:
Works with all the static ability minions mentioned above, one of the core aspects of the deck, but not essential to win in each match.
Rancid Rats:
A strong value minion, with two static abilities that provide strong synergy. Its ability to be returned to the battlefield adds significant card advantage by allowing you to always have a threat in taking out there higher cost minions.
Diregraf Colossus:
A questionable card in its worth, there are typically little to no zombies in your graveyard as when there is relentless dead will return its self or rancid rat, as such it likely will stay as a 2/2 body. The ability to generate tokens is incredibly valuable, although it is unlikely to be triggered often due to only have 11 other zombie cards (4 relentless dead, 4 rancid rats, and 3 other Diregraf Colossus). When it is triggered the token can take on the static abilities from Odric, and its worth is increased drastically.
Kalitas, Traitor of Ghet:
The premium token generator in the deck, the card allows for the death touch creatures to get even more worth by summoning a 2/2 zombie token. These tokens the get buffed by odric to allow for more death touch creatures and continued value. Kalitas also provides lifelink which can help enable Ayli to have a effective removal tool, and gain further card advantage. Kalitas can also sacrifice a creature that is about to be blocked and killed to gain +2/+2 as most of the creatures are zombies or vampires. In addition Kalitas can use relentless dead to continue to Buff itself providing the mana is there.
Gideon, Ally of Zendikar:
A somewhat questionable card, it does provide indestructible as a +1 ability and thus can make difficult to clear boards with odric. It also provides a token to gain abilities from Odric, and can generate an emblem to buff a large board. The card its self works perfectly in the deck, however the cost can be difficult to pay. With dual white being required it can sometimes be difficult to have the mana for it, but when you do the card will out perform most in the deck.
Drana, Liberator of Malakir:
Drana's flying with Odric allows for damage to go through by drastically limiting what can block the board, additionally first strike along with death touch creates a creature which can kill anything on board and still live. The +1/+1 can keep buffing the board whilst you establish tokens and other minions, gradually lowering the opponents health.
Ayli, Eternal Pilgram
Ayli's deathtouch work with odric, yet is not the main reason behind the cards worth in the deck. The ability to heal by sacrificing the tokens or relentless dead is invaluable for if you are struggling to stabilise after a bad start. The 2nd ability work well with kalitas, along with odric and other lifelink sources, to provide an efficent way to generate card advantage by removing one card for a token or relentless dead to be returned to hand. Additionally its low cost is great to push for tempo, to establish a strong efficient 2 drop that can trade up against higher mana cost cards.
Anguished Unmaking:
A strong powerful removal spell at instant speed that can remove a flipped westvale abbey or other tough to kill creature. Rather self explanatory, a simple removal spell although costly with a 3 life loss, hence only 2 in the deck.
declaration in stone:
A powerful tool to remove mass tokens if needed, along with deal with troublesome creatures such as others relentless dead. Its cheap effective, with the only downside of producing a clue for them, which in itself can make them loose out on tempo to crack it.
Grasp of Darkness:
Cheaply cost instant speed which can remove a 4 health creature, or reduce a creatures attack/ health to survive or block effectively. The 2 black is often able to be used, as majority of the mana is swamps.
Blighted Fen:
Still tossing up the benefit of the land, as its sacrifice cost is steep, and can sometimes be better to just have a plains.
Shambling vent:
A dual land which is essential to the deck, providing a big source of the White mana. Additionally the creature activation with lifelink work with odric, if activated before you declare combat. giving all your minions lifelink for that turn.
swamps:
11 swamps provide the bulk of the mana, as majority of the cards are 1 or two black to use, its essential to have more than 10 swamps.
Plains:
6 plains are used to fill out the rest of the white mana, more could be added over the blighted fen. But with only gideon having 2 white mana needed you dont need many plains.

If you have any suggestions for the main deck or even sideboard cards please feel free to suggest them. I am very new to magic so likely have some terminology wrong/ not aware of all the cards.

edits:
removed mortuary lands (they felt too slow, and often would come when unable to make use of the return feature)
added 3 swamps, 1 plains
removed one kalitas (due to cost of the deck to make, and lack of lands)
added one plains
Edit 2:
removed 4 diregraf colossus as didn't have enough value to it, and the deck lacked card draw.
replaced with 4 bygone bishops