Ancient City - Rainbow Ruins (Quarter Century Secret Rare) [RA03-EN181] Quarter Century Secret Rare

You must have this many "Crystal Beast" cards in your Spell & Trap Zone to activate and to resolve these effects.
• 1+: This card cannot be destroyed by card effects.
• 2+: Once per turn (including the opponent's) you can halve the battle damage you take.
• 3+: When a Spell/Trap Card is activated: You can send 1 "Crystal Beast" monster you control to the GY; negate the activation, and if you do, 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 target 1 "Crystal Beast" card in your Spell & Trap Zone; Special Summon that target.