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This game mechanic is detailed in the Master Rule (1 April 2020 Revision) under which states that If a card moves location from its activation location to a different location before its effect is activated, its effect cannot be activated (including mandatory effects)

And this doesn't even consider the rules change to Blood Moon that makes it into a Dark Depths combo piece, or the printing of Thespian's Stage (which is the primary Dark Depths combo in Legacy)

The mechanic has appeared infrequently since

Drafting red is becoming more and more difficult

and Elsa, Gloves Off

Scarlet ex has that advantage: its best cards and product identity point in the same direction