Sure, it costs five mana to do which is not cost efficient, but this just means you are not doing it till it is really good to do so or you have little else
Abilities like this continue to exist on cards today, known casually as "saboteurs." However, for a hot minute during Gatecrash and Dragon's Maze , Wizards of the Coast created an ability which could turn any creature into a saboteur: Cipher
The Most Competitive If I had to choose one of the decks to upgrade to a competitive level, itd be either of the tri-colored ones
Its a four-mana artifact that reads, At the beginning of your upkeep, starting with you, each player votes for carnage or homage
Most decks wont run Defiance Band because its so situationally useful, but those that do tend to run 1-2 copies of the card