How much attack does the winged dragon of ra have?

The new, legal print of The Winged Dragon of Ra, announced in Japan, still has an ATK of "?". Unlike on the show, it does not gain ATK based on what was used in its Tribute Summon, but when you Summon it you can pay your Life Points down to 100 and it gains as much ATK as Life Points you paid.

The Winged Dragon of Ra (Effect Monster)

DIVINE/Divine-Beast/Effect/10

ATK: ? DEF: ?

This card cannot be Special Summoned. You must Tribute 3 monsters to Normal Summon this card (You cannot Set this card). The Normal Summon of this card cannot be negated. When this card is Normal Summoned, the effect of Spells, Traps, and Effect Monsters other than this card cannot be activated. If this card is Normal Summoned, you can pay Life Points so that you only have 100 left to have this card gain ATK and DEF equal to the amount of Life Points paid. Also, you can pay 1000 Life Points to select and destroy 1 monster on the field.