Interesting fact, Urban Rivals does bans in large part because years ago, after one of their heads talked with me about issues with their meta, they ran a poll asking people basically if they would rather use errata to weaken over powered cards (my preferred method), or just out right ban them. The poll results were clear, people didn't want their cards they invested so much time or money in acquiring being weakened (a true head scratcher if you ask me cause at least a weakened card can still be used, a banned card can not), but at the time the game had two formats, one in which no bans occurred and one in which they did, so perhaps most people were playing in the more casual environment where no bans occurred and thus knew that asking for bans over errata would keep them dominating with their over powered cards in the banless format? Or maybe they just really hated the over powered cards and just didn't want to see them used at all, even in a reasonable manner.
Oh, and for the record, I was as shocked as anyone that they actually listened to me, responded to me, and put up that poll for me, as I was still pretty much a no body in the game at the time, only spent like 3 dollars on it and played very rarely/casually, just was very vocal on their forums. I don't believe it was until later that I became a top player in the game.
Anyway, the whole "ban a card" or "ban a race" things they've done over the years have definitely helped keep the meta less stale then alteil's has gotten at times, so I wouldn't be opposed to such a system in alteil, but I still believe now as I did then that the best answer is simply to errata and balance over powered cards. This last set had some serious balance issues, but in the past we've had plenty of very well made sets that when combined with erratas of old cards lead to very diverse metas. Whats more, with out a trading system and with getting new "playable" cards being much more difficult in this game, the potential for a player to not have enough cards left worth using after 1 or more of his key cards are banned, even if its only for a week, is something I think should be avoided. UR made acquiring multiple competitive decks very cheap and easy, if the key cards of one get banned it was rare a player didn't have a back up, but in Alteil your lucky if you ever manage to afford and construct even one competitive deck, if key cards from it get banned its almost like they're out right banning you yourself from the game.
So again, I'm not actually against this idea per say, it definitely would help shake up the meta while we're waiting for the next set or next group of erratas to come out, but I don't think it would work as well in alteil as it does in UR. And of course I definitely don't want things to ever become exactly like UR where they errata only to boost the power of cards, never to weaken them. Week long bans are a bandaid solution, the real fix is to actually fix the problem cards.
The bunnies of Lavato have special abilities, like 'Action Skill: Make Carrot Disappear.'