Superheavy Samurai General Coral

[ Pendulum Effect ] While you have a Spell/Trap Card(s) in your Graveyard, this card's Pendulum Scale becomes 4. Once per turn, when a "Superheavy Samurai" monster you control destroys an opponent's monster by battle: You can activate this effect; that monster can make a second attack in a row (even if this card leaves the field). [ Monster Effect ] If you have no Spell/Trap Cards in your Graveyard: You can Tribute up to 2 "Superheavy Samurai" monsters; draw that many cards. You can only use this effect of "Superheavy Samurai General Coral" once per turn.