This card's artwork depicts Mars being terraformed into an Earth-like planet.
This is based on an actual project that people hope will make Mars (and other inhospitable planetary environments, like Venus) able to support human life and habitats.
This card has an Effect Monster counterpart: Planet Pathfinder.
When "Thunder King Rai-Oh" is face-up on the field, you cannot activate "Terraforming", "Reinforcement of the Army", etc.: Can "Reinforcement of the Army" be activated when "Thunder King Rai-Oh" is face-up on the field?