Haystack

Good luck finding anything at this Exceptional Site

FoilBooster

Printings

Opponent’s deck searches are limited to the top three cards.

Market

$2.66

Low

$1.50

Median

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How does this interact with effects like Browse or Kelp Caverns, which do not say to search, but have you look at cards instead?

If the effect does not use the word 'search' in its text, it will not be limited by Haystack.

Does this apply if my opponent is searching my deck as well?

Yes! Any time your opponent is searching their deck or your deck, they only search the top three cards.