Boule de Combat Samouraï Supralourd SP17-FR011

If all the monsters you control are "Heavy Samurai" monsters, and you have no Spell/Trap Cards in your Graveyard, you can target 1 face-up monster your opponent controls that has a Level, send it and this card from the field to the Graveyard, then Special Summon 1 "Heavy Samurai" Synchro Monster from your Extra Deck whose Level is equal to the combined original Levels of those 2 monsters in the Graveyard. (This Special Summon is treated as a Synchro Summon.) You can only use this effect of "Heavy Samurai Blaster" once per turn.