I like the idea of a thief of sanity.dek where you play your opponent's stuff, but how good is it actually? I keep imagining situations where you spend all your mana on exiling stuff from the opponent's deck, only to get stuff you can't cast because its too expensive, or stuff that is too synergistical to their gameplan and that doesn't do much for you. It seems too slow, even for casual tables. Anyone got experience with it?