If you control no monsters, you can Normal Summon this card without Tributing. While this card is in a Monster Zone, you cannot Special Summon monsters from the Extra Deck, except Machine Xyz Monsters. If this card is Normal/Special Summoned: You can target 1 Level 8 or lower Machine monster in your GY; Special Summon that monster in Defense Position, also it becomes Level 9, but its effects are negated. You can only use this effect of "Arcjet Lightcraft" once per turn.