مفاعل المواد غيغادرا

You can discard 1 card; Special Summon 1 Level 3 Normal Monster from your hand or Deck, or if you discarded a Normal Monster to activate this effect, you can Special Summon 1 "Materiactor" monster instead. You can only use this effect of "Materiactor Gigadra" once per turn. You cannot Special Summon monsters from the Extra Deck, except Xyz Monsters.