Crashing Tide's ability there is not Characteristic-defining (CR 604.3a).
CR 112.6 determines where that ability applies. We need to find it applies in the library to make the search legal.
CR 112.6d says that this ability, which "grants [Crashing Tide] another ability that restricts or modifies how that particular object can be played or cast functions only on the stack."
(This rule is consistent with the steps for casting spells, which have been renovated lately to deal with the flash ability and other things that affect casting legality.)
So no, Crashing Tide does not have flash until and unless it is actually on the Stack and you control a Merfolk.
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CR 112.6 determines where that ability applies. We need to find it applies in the library to make the search legal.
CR 112.6d says that this ability, which "grants [Crashing Tide] another ability that restricts or modifies how that particular object can be played or cast functions only on the stack."
(This rule is consistent with the steps for casting spells, which have been renovated lately to deal with the flash ability and other things that affect casting legality.)
So no, Crashing Tide does not have flash until and unless it is actually on the Stack and you control a Merfolk.
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