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The kinds of deck that might benefit from this effect want the game to be won before this really comes online relevantly

The Secret Lair art remains unique to that drop, but 1 in 8 Streets of New Capenna Set Boosters will contain a card mechanically identical to the Secret Lair cards

In terms of Nidos, I've only seen these three, all from the Pikachu deck

Across all 28 cards in this list

Any "as [this artifact] enters the battlefield" or "[this artifact] enters the battlefield with" abilities of the copied artifact will also work

In the hands of an experienced player though, a well-timed Counterspell can end the game on the spot