If you cannot place a 'Crystal Beast' monster into your Spell and Trap Card Zone, the effect to prevent Battle Damage is not applied.
You cannot activate "Crystal Pair" if you do not have any open Spell or Trap Card Zone spaces.
If you cannot place a 'Crystal Beast' monster into your Spell and Trap Card Zone, the effect to prevent Battle Damage is not applied.
You cannot activate "Crystal Pair" if you do not have any open Spell or Trap Card Zone spaces.