MTG Salvation

Hey, I'm trying to make an infect deck but am unsure of what colors to use. And just card choices in general, and my cards are limited to what I have. I had the idea to start with black, then I changed my mind to black green, then changed my mind again to black and blue. But now just recently found some good red cards with infect and I have no clue how to go about this in general.

exactly

Hello, I'd like some input about this card combo that I have started making. When this deck is fully constructed, I'll pretty much be invulnerable with the cards that I'm putting in this deck and that will make it totally unusable in any tournaments which I think is kind of too bad but here's the card list I've got working so far:

Avacyn, angel of hope
platinum angel
sigarda, host of herons
ambush viper x4
albino troll x4
awakening zone x4
parallel lives x2
quicksilver amulet x2
artisan of kozilek x2
it that betrays
omnath, locus of mana

Can you explain to me about deck types please?

First of all, thanks for the feedback and second, how many lands do I need to add and what cards could I get rid of to put other cards in? You need to tell me what I could take out and put in if you know what that is. So do I post in in the modern deck section of this forum?

please educate me in the art of knowing what standard type is cause I have no clue whatsoever about where this deck should be posted.

What kind of deck would it be if not standard with lorescale coatl in it? cause I don't know squat about what's standard and what's not.

I don't know why but I made a vampire deck to see how it would go and it seems to play well against my own decks but I'd like a second opinion on the cards and how I could fix it if I need to. This deck, about 95% of the cards can be paid with three mana or less. I like to keep the cost down as much as possible. So here's the list:

Creatures:

gatekeeper of malakir
reassembling skeleton
rakish heir
stromkirk captain
falkenrath exterminator
vampire nighthawk x3
highborn ghoul
butcher ghoul
bloodrage vampire
falkenrath noble
crossway vampire x2
heirs of stromkirk
child of night
markov patrician

everything else:

victim of night x2
skullcrack
murder x2
searing spear x2
duress
brimstone volley x2
blightning
disentomb
ghoulcaller's chant x2
mark of the vampire
vampiric fury
urge to feed
gravepurge
soul bleed
pyroclasm
sulfuric vortex
illness in the ranks
vampire's bite
bump in the night

lands:

mountains x10
swamps x10

Hello all. This is an evolve deck that I have remade for the second time and wanted to see if it could be made better than it already is. Most of the cards in here can be paid with four mana or less but I want a second opinion on it.

Creatures:

Lorescale coatl x2
Battering krasis x3
cloudfin raptor x3
trusted advisor
giant adephage
timberland guide
crowned ceratok
crocanura x2
elusive krasis
shambleshark
adaptive snapjaw
ironshell beetle
clinging anemones
gyre sage
chronomaton x2
roaring primadox
primordial hydra
fathom mage
sapphire drake

Other Spells/Sorceries/enchantments:

bioshift x4
serene remembrance
burst of strength x2
steady progress
ring of kalonia
ring of evos isle
alpha authority
gridlock
unexpected results
forced adaption x2

lands

Island x9
Forest x10
Simic guildgate

I have been playing mtg for a while on and off for a few years and a few months back built me a deck that I've managed to win with at least once but it still needs editing.