Mana Dragon Zirnitron

If a Spell/Trap you control leaves the field because of an opponent's effect, and is now in the GY or banished (except during the Damage Step): You can Special Summon this card from your GY (if it was there when that Spell/Trap left) or hand (even if not), then you can Set 1 Spell/Trap that is banished or in your GY to your Spell & Trap Zone. You can only use this effect of "Mana Dragon Zirnitron" once per turn. If Summoned this way, banish this card when it leaves the field.

Dragon DARK Effect Monster 6 effect