This version of Ancient Mew is easy to distinguish from the others based on its visual differences alone
Moreover, both Horn Attack and Waterfall are normal, damage-dealing attacks with no additional effects ( e.g., some Pokmon have attacks that require the player to discard an energy card)
(2024-09-20) If your library contains only one card when you manifest dread, you'll look at that card and put it onto the battlefield face down
About Klefki (Shiny Treasure ex [SV4a] 264/190) The standout feature about this Klefki card has to be Mischievous Lock, its Ability
Unfortunately, theres no definitive answer, since so many cards in Magic are unique, and each card suits a different strategy
This is because Magic is an ever-changing game where new cards introduced into the environment make older cards more or less valuable