That is the life cycle of Decks in TCGs. Things rise up in the meta, while others fall. Some things will curl up and die, and rarely, if ever, be seen again.

Banebow is Tier 1 mate. Why else would the last WC final match be Amber vs Banebow IIRC.

Now you are correct that very little can stop his ability. Damage reducing attachments and supports are...