The number of keys to meet duelists is based on their level. Players have to use the more number of keys as the duelist's level is higher.
Required Key QTY (Neutral)
Required Key QTY (Color)
How to Get
Players can obtain gate keys as rewards for winning duels. Having duels against standard duelists will be the main way to collect the items. Standard duelists take 30 minutes to reappear after defeated, and players can get them to show up immediately by using the Duel Orb.
Gate keys are also rewards for completing weekly and stage missions.
Players can gain the items by defeating other players, although they will be stronger than standard duelists.
You can also convert no-colored gate key into the colored one by meeting Card Trader. However this way is undesirable relative to other ways noted above, since so many neutral gate keys are required to have a duel against legend duelists.
They need to update how keys are earned. 10 key limit per 8 hours at the trader is BS. I don’t even get why they have neutral keys along with the color keys, there’s no micro transaction reason to it so it’s just a pointless thing.
At what stage does Yami Yugi become available in gate? Currently I'm stage 25 and have a mission to defeat him for times to advance to 26. I'm gold 1 in rank and PvP will literally take forever to complete the mission..