That depends on your goal
"Avatar's" biggest weakness is that it will be lack luster on any 1-on-1 match up, forcing the owner to hope the opponent has more feeble monsters on their board, or go out of their way to prepare another monster that beats the opponent's board in terms of ATK power to deal any meaningful amount of damage with Avatar
banish the added card, and if you do, that player draws 1 card
Weathered Runestone Weathered Runestone can be excellent in decks using their graveyard for mechanics like delve or delirium that want to shut down creature-based graveyard strategies like Dredge and Reanimator
In fact, it was so well known for being good despite seeming bad, we probably shouldnt have missed out on Revenge of Ravens or Sanctum of Stone Fangs (which seems like a terrible place to seek peace)
Cartagena: Gandalfs sword Glamdring was something we thought about from very early on in the creative visual process