I also do not agree with making a proposal like this, modifying a card, which is already powerful in itself, to make it even more OP.
I can't believe this is allowed and the players themselves ask for it. Everyone knew the card's abilities and drawbacks, so they were free to decide to try to get it or buy it. Modifying it after the fact for the benefit of the big players seems overkill to me.
I have already come across this card at my level (Silver III - Gold III) and it is very useful and difficult to beat if you chain last hits with powerful monsters. All this does is condemn players who invest little money and show them that they have no place in the game.
I don't like these decisions being made in the game and they make me consider quitting.