Echo, for instance, used this trick
This would probably make the format less fun in general because instead of games being about what decisions you make or how your build your deck, your games against the most popular deck in the format would only be about how good you were at mulliganing into a game-ending, Turn-2 sideboard card
A former WotC public relations team member owned one example since 1998 and stated the card was created for media use to demonstrate what an English Pokemon card would look like
The objective to win within 14 turns is very manageable with this deck, as it has strong early-game tempo
Legends tell how the tarrasque slumbers in its secret lair beneath the earth, remaining in a dormant state for decades or centuries
Secret Lair x Final Fantasy: Game Over The first of the three drops focuses on the villains of Final Fantasy, with each getting some of the scariest interaction available in the game