Play the game to the strength of the wonder you are making. Example, pick military cards if you're playing Rhodes or pick resource cards if you're playing Giza.
Also, be very aware of timing. Does your opponent need brick to complete their structure and trigger the end of the game? Could it benefit you if you take that card instead? Always be in awareness of when war is triggered. Taking cards with horns might work to your advantage if your military is higher than other players.