War Rock Gactos

If an EARTH Warrior monster is Normal Summoned to your field: You can Special Summon this card from your hand. If this card is sent from your Monster Zone to your GY by an opponent's card effect: You can Special Summon 1 Level 5 or higher "War Rock" monster from your hand or Deck. You can only use this effect of "War Rock Gactos" once per turn.