Most spider creatures have reach, and they tend to have more toughness than they do power
I love the story of this card because he's so fearsome in the art, but what he does in the game is [run away]...This is a great example of combining the character [lore] with a fun card, Ryan Miller Kim adds that Rexs card also features Woody and Buzz glimmers in the background, protected by their fearsome Bodyguard
Furthermore, it allows you to quickly go through your library and win via alternate win conditions
This collection is among the first true variants that Magic introduced to the game, and they have a huge collectivity to them, making them highly sought after by players and collectors
My final advice would be: use the basic frame structure as a constraint (limitation breeds creativity, Mark Rosewater says), and if needed work from there to create new details that are really meaningful for the game, and be more careful not to create more noise