All face-up monsters on the field become Machine monsters.
All Machine monsters you control gain 500 ATK/DEF, also all Machine monsters your opponent controls lose 500 ATK/DEF.
You can banish this card from your GY, then discard 1 card; add 1 EARTH Machine monster from your Deck to your hand.
You can only use this effect of "Clockwork Night" once per turn.
You can only activate 1 "Clockwork Night" per turn.
Spell
Continuous
