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Traditionally when there is a positive change to the Arena economy there are cuts elsewhere to keep the economy from becoming more player-friendly overall, but in this case it seems like the addition of Golden Packs is all upside for players and should actually help make it easier for constructed players to build decks

The triggered ability doesns belong to the Bear, but to the Staff, so the triggered ability is also under your control

Pull rate from Regular Packs: 2.38% The estimated pull rate for Chinchou (Wisdom of Sea and Sky) from a Regular Pack is approximately 2.38%, meaning you might need to open around 43 Regular Packs to obtain it

In a similar vein, both players will likely have to confirm their approval of a proposed trade before it can go through, similar to trading systems in MMOs