Drop rate is 1%. (same as legendary rarity in boosters)
Syndicate contracts will each draw 3 cards per week.
(edit)
The rarest card in all the alpha collection should be the Elite Kumicho: considering every card has 2 % chances to be Elite. An Elite Kumicho is QL 13, meaning it is the maximum Quality in the game already.
such a cool card, really like the design 😜
do you need to open a contract or just holding it in your account gives you a chance of getting it?
The drops stack on all contracts you have.
But to receive the drops, you have to "open your contract loot" (which opens the open pack feature!). Opening the contract makes sure it is bound to your account.
This means contracts stack up their loot, but only for you.
Transferring or selling an unbound/unopened contract does not transfer its stacked loot. It's burnt/disappear when doing that (so far it is to avoid disturbing the market, stacked loot there will disturb drops single card value, and also unstacked contracts value).
However, a feature to "unbind" contracts you opened will also be made available at some point in later weeks. It will allow you to resell a contract you opened and exploited before, thus giving you excellent liquidity options!
Unbinding will put the contract on a long cooldown (ie 3 or 4 weeks) before it can be sold.
Sorry for all these details, I shared more than requested here ;)