A "Toolbox" is not a specific deck - it is actually a utility deck - usually having an answer for everything.
Just so happens I run one here on these boards for most of my games... If you'd like the decklist - let me know...
Here's an article on why someone would actually play one... written about a year ago...
From David Windmiller at Brainburst.com:
Onslaught is upon us, and while that to most of you means new Type 2, to me it means new Extended. Extended is one of my favorite formats (behind 1.5, but that's a different story).
So what are you going to play? You could go get old lists for decks and edit them, or you could go check what the pros played in Houston or Reims on Sideboard or Brainburst, but that's not for me. I happen to be more of a rogue player. So when I heard about the rotation of Extended, I sat and thought of what would be a good rogue deck against the metagame. The problem was I didn't know what the metagame would be because it would be a completely new format. The solution? Just make a deck that would have a good match up against EVERYTHING. Now you might say this seems impossible, I mean that IS the objective of deck-building, but I figured that I would just have a
toolbox deck, Like the old Recur-Sur decks.
Recur-Sur (Jason Rose)
CREATURES (31)
1 Uktabi Orangutan
2 Merfolk Looter
2 Tradewind Rider
4 Survival of the Fittest
4 Birds of Paradise
1 Fyndhorn Elves
1 Llanowar Elves
2 Quirion Ranger
4 Wall of Roots
1 Devout Witness
1 Monk Realist
1 Spike Feeder
1 Spike Weaver
1 Man O' War
2 Squee, Goblin Nabob
1 Sliver Queen
1 Krovikan Horror
1 Academy Rector
SPELLS (12)
2 Opposition
1 Recurring Nightmare
1 Enlightened Tutor
1 Vampiric Tutor
2 Winter Orb
3 Arcane Denial
2 Force of Will
LAND (17)
1 Bayou
4 Savannah
2 Taiga
4 Tropical Island
2 Undiscovered Paradise
4 City of Brass
SIDEBOARD (15)
4 Emerald Charm
4 Pyroblast
1 Bone Shredder
1 Winter Orb
1 Arcane Denial
2 Sanctimony
1 Light of Day
1 Aura of Silence
As you can see - there's an answer to just about everything in the deck...