Ancient City - Rainbow Ruins [FOTB-EN045] Ultimate RareSet: Force of the Breaker Card type: Field Spell Rarity: Ultimate Rare This card gets these effects, based on the number of "Crystal Beast" monsters in your Spell & Trap Card Zone. 1+: This card cannot be destroyed by a card effect. 2+: Once per turn, you can halve the Battle Damage you take. 3+: You can send a ""Crystal Beast"" monster you control to the Graveyard to negate the activation of a Spell or Trap Card and destroy it. 4+: Once per turn,