For the sake of simplicity, please use existing bonuses from the servers that are getting merged.
One of my favorites is US-Kerberos: -75% army training, -75% fleet training, +75% wood, 25% wine, 20% marble, 25% sulfur, 50% research costs, 2x research (from academies only).
Another is US-Hydra, 50% build speed, 30% wood, 50% marble.
EN-Zephyros also has a great set of options, 25% ship speed, 25% build speed, 40% wood/marble.