You want to take control of the game, How about playing everyone of your turns and your opponent's turn.  It's about as good as it gets!
 

Goblin Welder
(Rare-Fifth Dawn)

Mindslaver
(Rare - Mirrodin)

One of my personal favorites. You control all your opponent's turns! Even in
multiplayer, you can turn the other players against each other, and away from
yourself. This is the combo that currently holds the record for opponents
getting up and shouting "I CONCEDE!!!"
 

Goblin Welder
(Rare-Urza's Legacy)

Mindslaver
(Rare - Mirrodin)

If you don't want it on the board, it doesn't stay on the board. An ongoing
Plague Wind.

 

Goblin Sharpshooter
(Rare-Onslaught)

Death Pits of Rath
(Rare - Tempest, 8th Edition)

They attack. You block some and kill 'em, the rest get
through... and die. What if Plague Wind only costed three mana, and made you
pay 10 life? Seems a little more playable now. And here it is.
 

Instigator
(Rare-Mercadian Masques)

No Mercy
(Rare - Urza's Legacy)

Mind Twist is currently restricted in T1. This
is one that can be played every time you draw a card, no strings attached.
Even on your opponent's turn, you have some instant-speed discard and card
drawing (Necrogen Spellbomb, anyone?).
 

Geth's Grimoire
(Uncommon-Darksteel)

Words of Waste
(Rare - Onslaught)

Crucible of Worlds
(Rare Fifth Dawn)

 
Zuran Orb
(Uncommon - Ice Age)

Fastbond
(Revised Fastbond)

Whenever a creature comes into play,
untap all creatures. Tap five untapped elves you control: Put a 7/7 green
elemental creature token with trample into play. Infinite 7/7 tramplers. On turn four or five, if you pick the right elves. Killer, indeed.

Intruder Alarm
(Rare - 8th Edition)

Voice of the Woods
(Rare - Onslaught)

Your opponent can't draw anything, AND you've got a
10/10 beatstick. Plus, you've now got access to your opponent's library! I
for one, always find it satisfying to beat my friends with their own cards.
 

Shared Fate
(Rare - Mirrodin)

Leveler
(Rare - Mirrodin)

A new combo from the second set in Mirrodin Block, Darksteel. Equip your Spellbinder to ANY creature, and imprint the awesome Instant Savage Beating to it. When you attack, it activates Savage Beating's "take an extra attack step" ability. If you want double strike, you have to pay the entwine when it's activated, BUT who cares when you have an unlimited amount of attack phases with creatures that constantly untap!!

SpellBinder
(Rare - Darksteel)

Savage Beating
(Rare - Darksteel)