Young Silithar, Flash Reincarnation and 2x Earth Sphere you should absolutely find. After that, depends. If you’re doing Ancient Bonds you’ll want Golem Metallurgist, if you’re going rush aggro you’ll want Elucidator, if you’re playing Starhorn you’ll want Decimus.
All cards above are solid to craft EXCEPT the battle pets, absolutely don’t craft those. Gro was only good before the latest xpack and Rex has never been good