Your entire game design breeds toxicity. You do not have the depth or game complexity to warrant this kind of design.
Hearthstone developers, just because it seems like it would be fun or cool in your chocolate milk lan parties, does not mean it is good or healthy for the game.
Please stop with the toxic card design or implement a graveyard component and interaction. While also including ‘return all cards to their original users hand’ and a game lasting spell that dictates ‘your cards and deck may not be tampered with’.
It’s really not that hard.