Gone with the Wind

Exile up to X target creatures each with mana
value X or less. For each creature card exiled
this way, its controller creates a 1/1 white Bird creature token with flying. If X is 4 or more,
instead you create a 1/1 white Bird creature
token with flying for each creature card exiled
this way.
"It was better to know the worst than to wonder."
— Margaret Mitchell, Gone with the Wind.