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* 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.
* <s>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.</s><ref group=Out of Date name=OutofDate>A new [https://yugiohblog.konami.com/articles/?p=6351 rules] regarding [[Field Spell Card]] makes this ruling '''invalid'''.</ref>
* 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.
* '''[[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ref group=Out of Date name=OutofDate></ref> 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ref group=Out of Date name=OutofDate></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>"Ultimate Offering"'s effect is 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).
* 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]] and "[[Ancient City - Rainbow Ruins]]" will not be <s>destroyed by game mechanics</s><ref group=Out of Date name=OutofDate></ref>.<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"/>
}}
==Notes==
<references group=Out of Date/>
==References==
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