Blaze Cannon

(This card is also always treated as a "Blaze Accelerator" card.)
One "The Winged Dragon of Ra" you control gains the following effects until the end of this turn. This card's activation and effect cannot be negated.
●This card is unaffected by your opponent's card effects.
●When an attack is declared involving this card: You can Tribute any number of other monsters that did not declare an attack this turn; this card gains ATK equal to the Tributed monsters' combined original ATK, until the end of this turn.
●After damage calculation, if this card attacked: You can send all monsters your opponent controls to the GY.