Everytime an illusion is summoned in a place where it gets instantly destroyed, it drops a nora globe with the same value of a real champion.
Just had this happen in a game. In this case it was Grimlic illusions from Deception that was destroyed in a Deafening Aura field. The two i picked up gave nora equal to a real Grimlic. Edit: Sonic Elemental was deployed before Grimlic.
@Sokolov If you use Misdirection and then place a Poison Cloud on the spaces where the deployed champion is going to appear, all the resulting illusions die and drop nora globes. It isn't the most amazing combo/abuse but with a sufficiently expensive champion those nora globes add up! I'm sure someone will be able to find a better combo.