How is the Explorer used? We debated and came up with three possible solutions: Is this all your explorations for the turn? Is this for your first exploration? Or is this everyone's explorations for the turn?
I don't have the card in front of me right now but all evolution cards that modify actions only apply to the very next use of that action during the same round by the player that activated the card.
Just checked the card: whoever activates the card can choose from the 3 tiles for one exploration only, then the card is rotated and cannot be used by anybody else that turn (a turn being all action discs being placed).