Playing Yen Sid allows a card draw if a Magic Broom is in play, and having two or more Brooms in play will give Yen Sid a +2 to lore generation
While I dont think Vivi is on the level of anything currently on the banlist, it does feel like a card that could be central to a future broken deck, especially if Mox Opal becomes part of the equation again
Meeska Mooska, its time for another look at Disney Lorcana
Your opponent expects him to have to challenge or be useless as he doesnt have a valid target and has no lore You play Cogsworth Talking Clock and then exert Gaston for 1 lore That also allows you to avoid having to lose Gaston to a Simba Protective Cub A common earlier trade in the current meta Then play Lefou Instigator to ready Gaston, who keeps the ability from Cogsworth, because the ability is treated like its always a thing Gaston can do, as if it was written on his card Then Gaston can quest again for another lore, completely unexpected that early in the game You could also keep him ready and force removal cards to be used Cogsworth Grandfather Clock is a very good card
This isnt to say that emerald is weak, or doesnt have good cards