Harmonic Synchro Fusion — Ruling

Regola generale

About the『you cannot Special Summon monsters from the Extra Deck the turn you activate this card, except Fusion and Synchro Monsters』text:
This card cannot be activated during a turn in which you have already Special Summoned a monster, except a Fusion and/or Synchro Monster, from your Extra Deck. Also, after activating this card, you cannot Special Summon monsters from the Extra Deck for the rest of the turn, except Fusion and/or Synchro Monsters.

About this card's ① st effect:
Sending a face-up Tuner and a face-up non-Tuner you control to the Graveyard is a cost to activate this card.
When this effect resolves, Special Summon both monsters corresponding to the two ● bulleted descriptions. Both monsters are Special Summoned simultaneously. If you cannot Special Summon one monster for each ● bullet, the effect is not applied. (In this case, no monsters are Special Summoned.)
Whether the monster in question can be Special Summoned using the sent materials is determined when you resolve this effect, based on the current properties at the time of resolution of the monster that was sent to the Graveyard to activate this effect. (If any of the monsters sent to the Graveyard to activate this card no longer exist in the Graveyard by the time this effect resolves, the effect is not applied.)
This Special Summon is neither a Fusion Summon nor a Synchro Summon. (If a monster must be Fusion Summoned, or must be Synchro Summoned, it cannot be Special Summoned by this effect.)