I'm all over the place (in magic that is)
Green saprolings. Smother my enemies with hundreds of tiny fungus creatures!
Green Red Borbygmos Commander. Borbygmos is a huge cyclops who makes all of my creatures bigger when he hits people. everyone else is huge too.
Green White Black Doran Commander. Doran makes creatures deal combat damage equal to their toughness instead of power, and he costs so little so I can build my deck with high toughness low power cheap creatures who turn into hyper effecient high toughness high power.
Green Blue Simic/Spike. All of my creatures' power can be moved around the battle field, such as on those unblockable guys
Green Blue Stasis. Make it so no one can do anything with blue magic, but avoid my mass stasis with green magic
White Golem. Somehow I have made a white mana ramp/big beater deck
White Blue Azorious. I arrest/detain/paralyze anything that looks at me funny
White Blue Soldier/Enchantments/Unblockability. Most of my creatures are Soldiers or knights, most of my power and defense comes from enchantments, and I have many ways to make my creatures unblockable
Blue Milling. You can't play if you don't have a deck anymore, so everybody gets to draw 20 cards. every turn.
Blue Red I Have The Answer To Anything You Try. The cards involved are like 2/5 card drawing/cycling, 2/5 useful cards (such as lightning bolt or counterspell) 1/5 utility cards (like Arch Mage Ascension, which makes it so whenever I would draw a card I may instead look for one in my deck, or cards that let me shuffle my graveyard back into my deck)
Black sacrifice deck. Most of my cards either sac themselves for good effect, sac other things for good effect, benefit me when they die (like to my other cards that sac them), or cards that can come back from the dead (such as reassembling skeletons, who can be played from the graveyard). Also gravepact, which forces every opponent to sacrifice a creature whenever one of mine die.
Red burn deck. Not much to see here, just cards that set you on fire, summon elementals to set you on fire, or make me better at setting you on fire.
And then there's the WUBRG Sliver deck. A swarm of creatures who have abilities like "All Slivers have X" where X might be any existing ability, a stat boost, or some new ability like "(3), sacrifice this creature: destroy target permanent"
I think I like building decks more than I like playing with them.
i used to run blue white control before Jace The Mind Sculptor was banned 
