If you have "Mystical Space Typhoon" in your GY, or your opponent controls no Spells/Traps, you can Special Summon this card (from your hand). You can only Special Summon "Magnifistorming Erdam" once per turn this way. If this card is Normal or Special Summoned: You can add 1 "Magnifistorm" monster or 1 "Mystical Space Typhoon" from your Deck to your hand, except "Magnifistorming Erdam". You can only use this effect of "Magnifistorming Erdam" once per turn.