Gravitum

You may cast this as though it had flash only
when the stack is empty. Tap target creature. If
it is a nonlegendary, it doesn't untap during the controller's next untap step. When you cast this
spell, if this is your second spell this turn and
control Aphelios, search your sideboard for
Infernum or Crescendum. If this goes to the graveyard put it in your sideboard instead.