Joints of Bravery

[REQUIREMENT] Can be activated by revealing 1 Level 7 monster in your hand from turn 2 onward, if all of the monsters in your constructed Deck are EARTH Attribute Machine Type monsters. [EFFECT] Add 1 Level 2 or lower monster whose ATK is not 0 from your Deck to your hand (you can only add an Effect Monster once per Duel) and place 1 card from your hand on the top of the Deck. Then, you can make all face-up monsters with 1600 or more ATK on your opponent's field lose 300 ATK until the end of this turn.