Compagnons : d'une mécanique cheatée à une mécanique crappy
Source
New Companion Rule:
Once per game, any time you could cast a sorcery (during your main phase when the stack is empty), you can pay 3 generic mana to put your companion from your sideboard into your hand. This is a special action, not an activated ability.
Standard:
Agent of Treachery is banned.
Fires of Invention is banned.
Historic
Agent of Treachery is suspended.
Fires of Invention is suspended.