They're reskinned versions, with the same rules text, but in-universe MTG art and names
(If a creature with a finality counter on it would die, exile it instead.) As the snake sheds its skin to be born anew, we cast off death to rise as servants of Aclazotz. Vito, Church of Dusk heretic 2/3 Illustrated by Allen Douglas Standard Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
Working on cast and not entry is a huge bummer, but this is still a very powerful ability
Like most Magic: The Gathering cards, the value of Relentless Rats depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Secret Lair Drop)
By playing this card early in the game you have the opportunity to slam your creatures without fearing your opponent playing board wipes
Summoning sickness covers all permanents and creatures are the ones who suffer the consequences of it while other permanent types dont have to worry