Now, they have legs but there were years when there were no Merfolk being made, so of the four biggest creature types from the first set, they have the fewest numbers because of that
1005 Paradox Pokmon and is part of the M24 EN set, with the card number 011/015
This list doesnt include cards that make temporary copies that leave play at the end of the turn like Kiki-Jiki, Mirror Breaker or Flameshadow Conjuring
AVENGERS: ARMAGEDDON #1 (OF 5) CHIP ZDARSKY (W) Delio Diaz & Frank Alpizar (A) COVER BY DIKE RUAN MARVEL DIMENSIONS VARIANT COVER BY ALEX ROSS FOIL VARIANT COVER BY KAARE ANDREWS PROMO ART VARIANT COVER BY CHIP ZDARSKY SPOILER VARIANT COVER BY TBA VARIANT COVER BY JEROME OPEA VARIANT COVER BY SKOTTIE YOUNG VARIANT COVER BY JENNY FRISON VIRGIN VARIANT COVER BY JENNY FRISON MAGIC: THE GATHERING VARIANT COVER & VIRGIN VARIANT COVER ALSO AVAILABLE ARMAGEDDON HAS ARRIVED
I imagine its not very pleasant
Here's some examples: Cold Wave Confiscation Cyber Jar Delinquent Duo Dimension Fusion Heavy Storm Painful Choice Premature Burial Snatch Steal The Forceful Sentry Time Seal Lots of Spells on that list, and for good reason