Bribery.
How awesome would it be to be able to pay 20 bucks to get out of every speeding ticket...or whatever...and be successful with that bribe every time.
If you had destruction you wouldn't even need the 20 bucks. Destruction would be awesome, but there is one I would rather have for practicality.
Conjuration. Destruction has one flaw. Someone with a gun is likely to shoot you in the head while you are throwing fireballs, and you do not have the once a day 250 health healing ability. Conjuration on the other hand... you don't technically have to be there. Summon flame atronach, send him into the bank to rob it. Oh wait, money is flam... Correction, send frost atronach into the bank. Send flame atronach to the gas station

.
Send a scamp to do your laundry, send a deadroth to do anything physically intensive, have a golden saint as your personal body guard, have a winged twilight for picking up take out, and have a clanfear for taking to the dinosaur museum. Have him just stand really really still till someone gets really close and comments how real... and 'warm' he feels.