EDH Help: Mono-coloured Cards I Missed

Now, I obviously can't list every card you should have in your EDH deck and there are some that I find are more obvious inclusions than others because of their obvious greatness (also, I'm under self-imposed time constraints meaning I can't cover too many cards since I won't be able to at least attempt to keep up with my schedule). My posts would also end up being really really long if I covered everything (like this one will be).

HOWEVER, some people have pointed out that I "missed" some cards in my earlier articles, so I will go over them in one sentence or less right now. Also, it has become clear to me that the word "essential" may have been a poor choice of words on my part. I just think that the cards I mentioned are really good in EDH and are worth considering.

Blasphemous Act

Cheap boardwipe

Sylvan Primordial

Squishy elephant with a benefit

Mind Over Matter

Broken combo card

Malignus

Beatstick

Awakening Zone

Gribblies and mana

Academy Rector

Amazing tutor

Valakut, the Molten Pinnacle

Free damage

Vorinclex, Voice of Hunger

Mana ramp and lockdown

Living Death

Amazing boardwipe

Tooth and Nail

So good it should be banned

Urabrask the Hidden

Locks down opponents

Cyclonic Rift

Mono-blue boardwipe

Cabal Coffers

Black mana ramp

Rofellos, Llanowar Emissary

Super mana ramp

Gamble

Red's tutor

Command Tower

Do I need to explain this?

Doomed Necromancer

Instant-speed res

Concordant Crossroads

Mono-green's only mass haste

Goblin Welder

Gets rid of artifacts

I'll do multicolour and colourless cards soon, but I think I need to take a break from EDHing for a while.

P.S. I know that I didn't put every single "great" or "amazing" card on here but I have neither the time nor the space to cover every single relevant EDH card in one article. I'll get to them eventually, but I just wnated to give some newbies help in building EDH decks.