It *wants* to remain a mystery, banishing the curious in favor of less inquisitive company.

Ravnica Remastered

Cloudstone Curio

Whenever a nonartifact permanent you control enters, you may return another permanent you control that shares a permanent type with it to its owner's hand.

Whenever a nonartifact permanent enters the battlefield under your control, you may return another permanent you control that shares a permanent type with it to its owner's hand.

Aragorn took the green stone and held it up, and there came a green fire from his hand.

Tales of Middle-earth Commander

With innovative stabilizing techniques, Suja Pavani brings this piece of the sky itself to the Inventors' Fair.

Kaladesh Inventions

Ravnica: City of Guilds

Whenever a nonartifact permanent comes into play under your control, you may return another permanent you control that shares a permanent type with it to its owner's hand.