You don't choose a target creature at the time you cast this spell. Rather, a second "reflexive" ability triggers when you create two 1/1 blue Faerie creature tokens this way. You choose a target for that ability as it goes on the stack. Each player may respond to this triggered ability as normal.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.