why do mtg cards say deckmaster Card back Is the right card original?

There's an obvious reason why these cards have increased in value - Edge of Eternities has a new Sliver card, an artifact named Thrumming Hivepool that spits out Sliver tokens (and reimagines them as xenomorph-like creatures, a brilliantly subtle homage)

(The mechanic of the card really removes creatures from the game.) A lot of players miss exactly what the art is showing

However, since the creature is face down, it remains a 2/2 colorless creature with no name, types, or abilities, and no mana cost

Outside of a hard removal spell, theres not much your opponents will be able to do to stop this Dinosaur from sweeping the board