Hmmm...
WT has 2 usages. One is the dream situation, where you get to cast him into an ally-less board. Which essentially gives you at least one card the next turn. Together with research = tons of card advantage.
Secondly, as a meat shield. You have no heals, so any ally you drop, especially with an ability like a WT, will get all the cards thrown on him immediately.
Fireball, assassinate, crippling blow, etc. As long as he doesn't get returned to your hand, WT has played its part, which is to absorb damage away from you, and more importantly, the PB/Oggy that you'll be dropping next.
Besides, in a worst case scenario, a turn 5 supernova + return WT to play with Lightning strike in hand, is a very decently strong play.
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