This wasnt true for English Pokmon cards until last years Scarlet & Violet release
Should you find yourself mana-screwed, you wont have the security of a hand full of resources to deploy once you find lands, and its a do-nothing top deck later in the game when you need action
There are a handful of classic creatures that perform this role admirably: Iridescent Angel, Simic Sky Swallower, and such
Crystalline Sliver A built-up board full of slivers is almost unstoppable - unless your opponent picks off a key creature at just the wrong moment
If the copied creature is a token, Mockingbird copies the original characteristics of that token as stated by the effect that created that token, with the noted exceptions
They put the rest on the bottom in a random order.) Instant Interaction (CTRL to add secondary) Land Demolition Field : Add