If this card is in your hand or Graveyard: You can discard 1 "Crystron" card, except "Crystron Sulfefnir"; Special Summon this card in Defense Position, then destroy 1 card you control. If this card on the field is destroyed by battle or card effect: You can Special Summon 1 "Crystron" monster from your Deck in Defense Position. You can only use each effect of "Crystron Sulfefnir" once per turn.
Special Summons a Crystron monster from your deck when destroyed.
Requires you to discard a Crystron monster to Special Summon.
Destroys one of your cards when Special Summoned by own effect.
Not as strong as other monsters of the same level.
Special Summons itself in defense position.
Crystron Tuners are usually the best monsters you can Special Summon from the deck when Crystron Sulfefnir is destroyed. These Tuner monsters Special Summon a Crystron non-Tuner and immediately Synchro Summon with them.