Playing on its rarity:
* Samarium: Rare, but powerful.
* Uncommon, but unforgettable.
* The secret element of success.
Highlighting its uses:
* Samarium: The power behind the light. (Referring to its use in magnets)
* From lasers to medicine, Samarium is everywhere.
* Samarium: Making modern technology possible.
Focusing on its scientific nature:
* Samarium: Unveiling the mysteries of the universe.
* The element that defies expectations.
* Explore the world of Samarium.
Humorous options:
* Samarium: It's not just for magnets anymore.
* Don't be a fool, choose Samarium! (Parody of a common saying)
Ultimately, the best slogan will depend on the target audience and the message you want to convey.