If there are no legal targets to choose from, the target isn't changed
Even though exalted hasnt appeared in a lot of sets, it's still used sparingly in supplementary sets
The trick is to make sure your cheat-in target like Omniscience or Atraxa, Grand Unifier is far more impactful than what your opponents can play
Tamiyo, Inquisitive Student / Tamiyo, Seasoned Scholar seems like an option in Historic wizards that can get to its draw-third-card payoff, and someone will try brewing fevered combos with Sorin of House Markov / Sorin, Ravenous Neonate, but Im not seeing it
AETHERFLUX CONDUIT Hey, its a piece of Aetherflux Technology
The design doesn't use just any trigger, it uses the trigger from Innistrad block that turned Werewolves back into Humans: the casting of two cards on any one turn by the same player