There have been plenty of discussions in the past about the dangers of a banned-as-companion list: it's one more list you have to track and adds complexity, among other reasons
EX BURST When Rikku attacks, choose 1 Forward opponent controls
The main catch to Kiki-Jiki is that its expensive and fragile, and itll certainly die over and over as other players wont be keen to see you go infinite
Wilds of Eldraine preview season kicks off on August 15th
If youve never set foot in the world of Magic: The Gathering before then I should imagine that sounded a touch confusing, and youre not going to know your Genesis Hydra from your Polymorphous Rush
Later in the game, you can pay two black and two red, as well as exile five other cards from your graveyard, in order to bring Kroxa back onto the battlefield and force your opponent to discard again