Ancient City Rainbow Ruins

This card gets these effects, based on the number of Crystal Beast monsters in your Spell and 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 1 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, during your Main Phase, you can draw 1 card. 5: Once per turn, during your Main Phase, you can Special Summon 1 Crystal Beast card from your Spell and Trap Card Zone