View source for Card Rulings:Ancient City - Rainbow Ruins

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==OCG Rulings==
[Regarding the effect "''You must have this many "Crystal Beast" cards in your Spell & Trap Zone to activate and to resolve these effects.''"]<ref name="No.7079">{{cite web|url=https://www.db.yugioh-card.com/yugiohdb/faq_search.action?ope=4&cid=7079&request_locale=ja |title=Ancient City - Rainbow Ruins |website=Konami OCG Card Database |access-date=2023-02-25}}</ref>
* It is not treated as an effect.
[Regarding the effect "''● 1+''"]<ref name="No.7079"/>
* It does not start a [[Chain Link]] and is applied in the Field Zone.
[Regarding the effect "''● 2+''"]<ref name="No.7079"/>
* It does not start a Chain Link and is applied in the Field Zone.
* It can be applied during [[damage calculation]] when you would take battle damage.
[Regarding the effect "''● 3+''"]<ref name="No.7079"/>
* It starts a Chain Link and can be activated in the Field Zone.
* It can be activated directly in [[Chain]] to the activation of a Spell/Trap Card. (It is a [[Spell Speed 2]] effect.)
* It cannot be activated during the [[Damage Step]].
[Regarding the effect "''● 4+''"]<ref name="No.7079"/>
* It starts a Chain Link and can be activated in the Field Zone.
* It can be activated during your Main Phase.
[Regarding the effect "''● 5''"]<ref name="No.7079"/>
* It starts a Chain Link and can be activated in the Field Zone.
* It can be activated during your Main Phase.

===Q&A Rulings===
{{Ruling
| Q = When resolving the effect "''● 3+''" of "[[Ancient City - Rainbow Ruins]]", if I have 2 or less "[[Crystal Beast]]" cards in my Spell & Trap Zone, how does the effect resolve?
| A = Even in that case, the activated effect "''● 3+''" resolves as usual. Similarly, when resolving the effect "''● 4+''" or "''● 5''", even if you no longer meet its conditions ("[[Ancient City - Rainbow Ruins]]" no longer has the gained effect), the effect resolves as usual.
| cite = 6642
| date = 2023-02-25
}}

{{Ruling
| Q = While the effect "''● 1+''" of "[[Ancient City - Rainbow Ruins]]" is being applied, if an effect that destroys multiple Spell/Trap Cards is activated, such as "[[Heavy Storm]]", "[[Demise, King of Armageddon]]", or "[[Malevolent Catastrophe]]", the "[[Crystal Beast]]" cards in the Spell & Trap Zone are destroyed, but is the "[[Ancient City - Rainbow Ruins]]" in the Field Zone also destroyed?
| A = While the effect "''● 1+''" of "[[Ancient City - Rainbow Ruins]]" is being applied, "[[Ancient City - Rainbow Ruins]]" is not destroyed when the effect of "[[Heavy Storm]]" or "[[Demise, King of Armageddon]]" resolves.
| cite = 6641
| date = 2017-03-24
}}

==Previously Official Rulings==
{{Previously Official Rulings |UDE's Rulings =
* These effects are cumulative. For example, if you have 4 or more "[[Crystal Beast]]" monsters in your [[Spell & Trap Card Zone]], this card gets all of these effects except the last one.

* Only the [[controller]] of this card can use these effects.

* If this card’s first effect, “This card cannot be [[destroy]]ed by a card effect.” is active, this card can be [[target]]ed by “[[Mystical Space Typhoon]],” etc., but this card will not be [[destroy]]ed.

* If you [[control]] this card and have at least 1 “[[Crystal Beast]]” in your [[Spell & Trap Card Zones]], and they would all be [[destroy]]ed at the same time then “[[Ancient City - Rainbow Ruins|Ancient City – Rainbow Ruins]]” is not [[destroy]]ed.

* This card’s effects are not applied until its activation is resolved. If you have 1 "[[Crystal Beast]]" monster in your [[Spell & Trap Card Zones]] when you [[activate]] this card, and your opponent Chains “[[Mystical Space Typhoon]],” etc., this card will be [[destroy]]ed.

* If “[[Crystal Beast]]” monsters in your [[Spell & Trap Card Zones]] are [[destroy]]ed in a [[Chain]] to the activation of any of this card’s effects that can be [[chain]]ed to, then this card’s effect is not applied. The correct number of “[[Crystal Beast]]” monsters must be in your [[Spell & Trap Card Zones]] when the effect [[resolve]]s.

* This card’s effect “Once per turn, you can halve the [[Battle Damage]] you take.” does not start a [[Chain]]. You choose whether or not to activate it during [[Damage Calculation]], when you would take [[Battle Damage]].

* This card’s effect “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.” is [[activate]]d in a [[Chain]] to a Spell or Trap Card. It is treated as [[Spell Speed 2]], so you cannot [[Chain]] this effect to a [[Counter Trap Card|Counter-Trap Card]]. You can [[activate]] it multiple times in the same [[Chain]]. Sending a “[[Crystal Beast]]” monster you [[control]] to the [[Graveyard]] is a [[cost]] to [[activate]] this effect.

* This card’s effect “Once per turn, during your [[Main Phase]], you can draw 1 card.” starts a [[Chain]]. It can only be used once a turn, even if the number of “[[Crystal Beast]]” cards in your [[Spell & Trap Card Zones]] becomes less than 4, and then becomes 4 or more again after you have used it in a given turn.

* This card’s effect “Once per turn, during your [[Main Phase]], you can [[Special Summon]] 1 "[[Crystal Beast]]" card from your [[Spell & Trap Card Zones|Spell & Trap Card Zone]]” starts a [[Chain]]. It [[target]]s 1 “[[Crystal Beast]]” card in your [[Spell & Trap Card Zones]].

===Mentions in Other Rulings===
* '''[[Card Rulings:Field Barrier|Field Barrier]]''': This card only prevents the activation of Field Spell Cards themselves. The effects of a Field Spell Card already on the field (like “[[Ancient City - Rainbow Ruins]]”) can still be activated while this card is in play. 

* '''[[Card Rulings:Last Resort|Last Resort]]''': This card is resolved as follows: First, select 1 “[[Ancient City - Rainbow Ruins]]” from your Deck and place it in your Field Spell Card Zone, then <s>your opponent’s Field Spell Card is destroyed</s><ref group="Out of Date" name="Two Field Spell"/> and they draw one card. 

* '''[[Card Rulings:Last Resort|Last Resort]]''': You can activate “[[Last Resort]]” while you have a Field Spell Card in your Field Spell Card Zone. When “[[Last Resort]]” resolves, the Field Spell Card in your Field Spell Card Zone is <s>destroyed</s><ref group="Out of Date">According to the [https://yugiohblog.konami.com/articles/?p=6351 new game mechanics for Field Spell Cards], if you activate a new Field Spell Card to replace another, then the old one is sent to the Graveyard, not destroyed.</ref> and “[[Ancient City - Rainbow Ruins]]” is placed into your Field Spell Card Zone. 

* '''[[Card Rulings:Light and Darkness Dragon|Light and Darkness Dragon]]''': “[[Light and Darkness Dragon]]” cannot [[negate]] the activation of the [[Ignition-like effect]] of [[Continuous Spell Card|Continuous Spell]] or [[Continuous Trap Card|Trap Cards]] ({{sic|{{Span|<nowiki>The effect of "Ultimate Offering" is a Quick-like Effect</nowiki>|“Ultimate Offering”}}}}, etc.) or [[Field Spell Card]]s (“[[Ancient City - Rainbow Ruins]]”, etc.). “[[Light and Darkness Dragon|Light and Darkness Dragon’s]]” second effect activates when a Spell or Trap Card is first activated (placed face-up onto the field or flipped face-up).

===Judge List Rulings===
* The "''3+''" effect of this card cannot be activated during the [[Damage Step]].<ref>[http://web.archive.org/web/20071101060844/http:/entertainment.upperdeck.com/community/forums/thread/847126.aspx UDE Judge List]: Ancient City – Rainbow Ruins effect three</ref>

* A card like "[[Magic Jammer]]" can only be chained to ''the initial activation'' of "[[Ancient City - Rainbow Ruins]]". If ''the effect''  of "[[Ancient City - Rainbow Ruins]]" is activated then "[[Magic Jammer]]", ect, cannot be chained.<ref>[http://web.archive.org/web/20071101063805/entertainment.upperdeck.com/community/forums/thread/850949.aspx UDE Judge List]: Ancient city vs negation</ref>

* If you have "[[Ancient City - Rainbow Ruins]]" face-up on the field and your opponent activates another [[Field Spell Card]] you can chain "[[Ancient City - Rainbow Ruins]]'s" third effect to negate the activation of the [[Field Spell Card]] <s>and "[[Ancient City - Rainbow Ruins]]" will not be destroyed by game mechanics</s>.<ref group="Out of Date" name="Two Field Spell"/><ref name="UDEJL-ACRR">[http://web.archive.org/web/20071013014541/entertainment.upperdeck.com/community/forums/thread/854302.aspx UDE Judge List]: Active Field Card versus Set Field Card ...</ref>

* If you activate "[[Ancient City - Rainbow Ruins]]" while you have a face-up "[[Crystal Beast]]" card in your [[Spell & Trap Card Zone]] and the opponent chains with "[[Mystical Space Typhoon]]", then "[[Ancient City - Rainbow Ruins]]" will be destroyed. "[[Ancient City - Rainbow Ruins]]'s" first effect is not applied since "[[Ancient City - Rainbow Ruins]]" hasn't resolved yet, so it does not protect "[[Ancient City - Rainbow Ruins]]" from "[[Mystical Space Typhoon]]'s" effect.<ref name="UDEJL-ACRR"/>

===Out of Date===
* This card will be [[destroy]]ed if your opponent plays a [[Field Spell Card]], even if the effect “This card cannot be destroyed by a card effect.” is active.<ref group="Out of Date" name="Two Field Spell">According to the [https://yugiohblog.konami.com/articles/?p=6351 new game mechanics for Field Spell Cards], now both players can have an active Field Spell Card on their field at the same time, so the other player's Field Spell Card will not be destroyed if their opponent plays one.</ref>
}}

==Notes==
===Out of Date===
<references group="Out of Date"/>

==References==
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