Word of Command

Word of Command is a card I've been looking at for ages trying to think of a reasonable deck for, I think what I've got so far is pretty decent, it definitely needs some improvement though. For those of you who don't know Word of Command here it is:

Word of Command
BB
Instant
Look at target opponent’s hand and choose a card from it. That player plays that card with his or her own mana, but you make all decisions it calls for. The player is required only to use mana in his or her mana pool and mana that can be drawn from lands.

The main problem that this card faces is your opponent playing the spell in advance, in which case your left with a dead card.

Here's the deck so far:

Main Deck:
4 Word of Command
3 Duress
3 Cabal Therapy
4 Force of Will
4 Mana Drain
3 Mesmeric Orb
4 Brainstorm
1 Ancestral Recall
1 Time Walk
1 Demonic Tutor
1 Vampiric Tutor
1 Imperial Seal
1 Tinker
2 Mindslaver
2 Gaea's Blessing
2 Darksteel Colossus
1 Black Lotus
1 Mox Jet
1 Mox Sapphire
1 Mox Emerald
1 Lotus Petal
1 Sol Ring
4 Dark Ritual
4 Underground Sea
4 Tropical Island
1 Strip Mine
1 Tolarian Academy
2 Tree of Tales

Sideboard:
4 Leyline of the Void
1 Timetwister
3 Disrupting Shoal
3 Darkblast
4 Platinum Angel

The main idea of the deck is to deck your opponent with Mesmeric Orb, the Colossuses are just there as a secondary kill condition. Duress, Therapy, FoW etc are pretty self explanatory. Word of Command and Mindslaver are used to force your opponent to play the highest cost card (within reason) so they deck out faster. I'm thinking of inculding Sphere of Resistance and Trinisphere, this could stop decks "going off" as fast as normal and will mean more cards from Mesmeric Orb. The deck feels a little too slow though and I don't particularly like the mana base. Any help would be appreciated so much, cheers guys!!!!!