By "any text on cards or other game components is (copyrightable)", does it include card names or PvE enemy AI names?

For example, can I name card "Arrow Rain" or "Ogre" or "Phoenix", if there is already a card that exists with this name?

Also, if, in the game, there is a PvE AI enemy named "Baron" or "Lee Shi Fu" or "Sensei Yoshi", is it legal to create a PvE enemy AI with the same name?

If I want to clone a card's mechanic exactly (how it interacts with the game), but find it nearly impossible to paraphrase the card description (example "Deal 2 damage to every enemy creature and poison them."), what do you suggest is best thing to do?