name: Treetop Defense
originalText: Play Treetop Defense only after you're attacked, before you declare interceptors.
  This turn, all your creatures can intercept as though they had flying.
printings: POR
text: Cast this spell only during the declare attackers step and only if you've been attacked this step.
  Creatures you control gain reach until end of turn. (They can block creatures with flying.)
type: Instant