Ancient City - Rainbow Ruins

This card gets these effects, based on the number of Crystal Beast monsters in your Spell & Trap Card Zone. A) 1+: This card cannot be destroyed by a card effect. B) 2+: Once per turn, you can halve the Battle Damage you take. C) 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. D) 4+: Once per turn, during your Main Phase, you can draw 1 card. E) 5+: Once per turn, during your Main Phase, you can Special Summon 1 Crystal Beast card from your Spell & Trap Card Zone.