Ender_ Endbringer's deck stategies
These deck strategies may be used at free will, so you may tell any one about the strategies if you like, but the strategies are typed assuming that you know the name of the card and what it does. If you do not know what a card does please email me with the name of the card, and I will tell what it does. Or go to html://www.magicthegathering.com/. 
Simple,Fairly easy,Not too hard or easy,Difficult,Damn near impossible!
Ender's Home page Magic: the Gathering page
Here they are:
Invincibility!
Put a Pariah on a creature with Inviolabitity and suddenly you cannot be damaged until one of the enchantments is destroyed.  This does not make you invincible to cards that will make you loose life, because that is different than dealing damage.  The creature can also be killed if it gets -0/-X where X is its toughness..  So you aren't really invincible, just temporarily, sometimes permanantly.
Best creature and land destruction!
Use a Joreal, Emperess of Beasts to change all of your opponents land into creatures, then use Wrath of God and all of the creatures are destroyed, along with your oppontents lands.
Big creatures or Fire Balls!
Use elves to produce a bunch of mana, then use a Fire Ball or Ivy Elemental, if you want more mana use a Vitalise to untap all of your elves and make more mana, then use a Rancor to give your Ivy Elemental Trample and attack (You can do this in a single colored deck so this is probably the easiest one here)
All opponent's creatures gone!
A way to get rid of all of the creatures that your opponent controls is to use a Humility and then a Simoon.  Afterwards use something like Wax/Wane to get rid of the Humility.
Lots of Damage!
Put out a creature like Shivan Dragon or something that has the Firebreathing ability.  Then hope it has flying and put out a Citadel of Pain that tap all of your lands for the creature and attack.  The Citadel of Pain will do the rest.
The hardest deck Strategy you will ever find, but it works.
Put our a Serra Avatar.  Switch control of  it with a Phyrexian Infiltrator and use Agonizing Domize with the kicker on the Serra Avatar.  The bad thing is that  you need at least 8 mana and 4 of it has to be blue.  You also need a four colored deck to be able to do it.  By the way,  while using the Phyrexian Infiltrator you may target one of there creatures then one of yours and keep your Phyrexian infiltrator and switch two other creatures instead.  This must be done all at once to be  effective.  If they already have a Serra Avatar out then just use Agonizing domize with the kicker and poof! This is now one of the easiest deck Strategies.  The bad thing is that you need every single color except green to do this one.
OTHER
I know more but I guess that they are other peoples' property so I will ask their permission before using them.  Some of the best deck ideas are the simplest... Like flying creatures and counterspells, even though counterspells are cheap(I mean that in a bad way). 
Nemata Grove Gardian is a deck idea herself, just throw in an Overrun.  Most of the Deck Ideas I have above are fun or at least creative.  Stay away from counterspells they are pure evil.  Burn is pretty cheesy too.