The anime says that the Winged Dragon of Ra's attack and defense is what is added up by the attack and defense of the tributes to summon it. From the Yu-Gi-Oh wiki:
When Summoned by Tributing 3 monsters, the ATK and DEF of "Ra" become the combined ATK and DEF of the Tributed monsters.
The card that is legal for tournaments does not say that on the card. Is the anime effect OK to use in a actual card game?
Similarly, people are saying how you can give life points for the attack like in the anime, but I'm asking if we can use the effect in a duel.