Its not an specific card that need nerf but the whole game. They can't have a game with discover mechanic <-- this kill the game, you use 20+ extra cards outside your deck to put into play.. that's not cool...
If they want to change the game, what not a game mode with "card ban week rotation" into game ?
Example: From 03/04/2021 until 10/04/2021, Tickatus Refreshing Spring Water are not available into competitive mode.
They could also include the community to upvote each card they want to ban in a week and the next week the banned cards are allowed again and others enter into rotation.