If you control "Visas Starfrost" or a monster with 1500 ATK/2100 DEF, you can Special Summon this card (from your hand). You can only Special Summon "Mannadium Fearless" once per turn this way. If this card is destroyed by battle or card effect: You can Special Summon 1 "Mannadium Fearless" from your Deck, also during the Battle Phase this turn, Synchro Monsters you control gain 500 ATK.