Monsters can also be Special Summoned onto the field through the effect of another card. This is different from “Special Summon Monsters.” You cannot use a card effect to Special Summon those monsters from your hand, Deck, or the Graveyard unless it was properly Special Summoned first. For example, if a Synchro Monster is sent from your Extra Deck to the Graveyard without being Synchro Summoned, you cannot use a Spell Card to Special Summon it from the Graveyard, because Synchro Monsters have to be properly Special Summoned first, before they can be Special Summoned by another card’s effect.