Ancient City - Rainbow Ruins [FOTB-EN045] 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, 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 & Trap Card Zone."