In magic slang, a Bear is any creature with the same converted mana cost and size as Grizzly Bears, Ashcoat Bear, Balduvian Bears, Bear Cub, Forest Bear, and Runeclaw Bear: Two power and two toughness for two mana
In addition to Astarion, when Wizards of the Coast first announced the sets at Gen Con they also unveiled a card for Karlach, so it remains to be seen if she will get her own full set or if her card is simply one piece to a set shared with others.
Once per turn, at the start of the Damage Step, if this card battles an opponent's monster: You can banish that opponent's monster, face-down
For you, the players, it means that we ask for a little more patience
They allow savvy know-it-alls to leverage subtle interactions against their opponents, which only creates disparity between those who study the corner-cases and those who take the card text at face value