Giving something the ability to challenge ready characters and survive the challenge is quite good
This eight-drop mythic rare in White may have a smaller 3/3 Indestructible body but makes on arrival and four turns of play not one, not two but
Sami, Ship's Engineer embodies this strategy perfectly, generating a Robot token at the end of your turn
The same is true for expensive cards, you can get away with being a little more top heavy as you have ways to make use of those card when you can't simply cast them
Other than the pull rates and the icon at the bottom, they look similar to each other, though often the higher rarity cards also include better play mechanics
The Red one just has a 1/1 body, but it can tap with three mana to fight, and when it is dealt damage you can redirect it