Once per turn, when an attack is declared involving 2 EARTH monsters: You can negate that attack. You can only use each of the following effects of "Magnet Warrior Sigma Minus" once per turn. You can reveal this card in your hand; Fusion Summon 1 Fusion Monster from your Extra Deck, using Rock monsters from your hand or field, including this card in your hand. If this card is Normal or Special Summoned: You can send 1 Level 8 "Magna Warrior" monster from your Deck to the GY.