In terms of guild contribution, those two only. so assuming every season, you ended on Silver league, only 60 DEC is required. But of course, you can donate more than. The CLP raffle is for those members willing to donate more as an incentive.
Other requirements would be joining discord for announcement. Owning cards is not mandatory but would be good as it means you are in for the long-term. It also helps as you won't need to rent cards during brawls, or atleast minimize rental cost.