Ancient City - Rainbow Ruins | SGX1-ENF10

Set: Speed Duel GX: Duel Academy Box
Number: SGX1-ENF10
Rarity: Common
Attribute: SPELL
Card Type: Field Spell
Description: You must have this many "Crystal Beast" cards in your Spell & Trap Zone to activate and 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 Card Zone; Special Summon that target.