During the Main Phase, if this card is in your hand (Quick Effect): You can target 1 "Mannadium" monster you control or 1 monster you control with 1500 ATK/2100 DEF; destroy it, and if you do, Special Summon this card. If this card is Normal or Special Summoned: You can add 1 "Mannadium" card from your Deck to your hand, except "Mannadium Riumheart". You can only use each effect of "Mannadium Riumheart" once per turn.