Cold Feet

 This and The Humble Sentry are both versions of Forbidden cards that instead negatively affect the player; this is a counterpart to Cold Wave while The Humble Sentry is a counterpart to The Forceful Sentry.

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Both are joke cards that were designed to be intentionally bad.

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This card is also a lore card, depicting the origin of Frostosaurus and the buildup of ice covering his body. This might imply that the Frostosaurus used to be a Bracchio-raidus before this extreme storm mutated him.

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OCG Rulings

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This effect is only applied to the player who activated this card.: Spell Card > Cold Feet

The opponent can still activate Spell or Trap Cards.

During the turn in which "Cold Feet" has been activated, "Silver Sentinel" cannot be Set as a Spell Card.: During the turn in which "Cold Feet" has been activated, can "Silver Sentinel" be Set as a Spell Card?

If you activate "Cold Feet", you can chain other Spell and Trap Cards to its activation. Also, even if you activate "Cold Feet" as chain 2 or higher, the cards that have been activated before "Cold Feet" still apply their effects. Therefore, the cards activated before "Cold Feet" don't have their effects negated.: If you activate "Cold Feet", can you chain other Spell and Trap Cards to its activation?
Also, if you activate "Cold Feet" as chain 2 or higher, are the cards that have been activated before "Cold Feet" negated once the chain resolves?

If you activate "Cold Feet", "Mystical Refpanel" can be activated. Also, if the effect of "Cold Feet" is switched to affect the opponent by the effect of "Mystical Refpanel", the opponent cannot use the effects of Spell or Trap Cards or Set them during the turn in which "Cold Feet" was activated.: If you activate "Cold Feet", can "Mystical Refpanel" be activated?