What is the name of anime that showed in 90s where a brother and sister would gather cards use them to fight prince character who flew around ship shaped like lion?

The anime you're describing is most likely "The Vision of Escaflowne" (also known as "Escaflowne").

Here's why:

* Brother and Sister: The main characters are Hitomi Kanzaki and Van Fanel, who initially believe they are brother and sister.

* Cards: The series features "Gaia Stones" which are used to summon powerful creatures and vehicles for battle.

* Prince character: Van Fanel is a prince from the flying kingdom of Fanelia.

* Ship shaped like a lion: The main vehicle of the Fanelia kingdom is a giant, flying ship called "Escaflowne" which is vaguely shaped like a lion.

"The Vision of Escaflowne" aired in the late 90s and is known for its beautiful animation, complex characters, and engaging storyline.