Tribute 1 Dragon-Type monster; destroy all face-up monsters on the field whose DEF is less than or equal to the ATK the Tributed monster had on the field.
Rulings
Netrep Rulings
"Burst Breath" may be activated if the only face up monster is the Dragon to be used as a Tribute.
If "Soul Exchange" has targeted a face-up Dragon Type monster on the opponent's field, "Burst Breath" may use that monster as a Tribute.
Trap|
Normal