You can Normal Summon this card with 1 Tribute, or without a Tribute. (1) The ATK of this card is equal to the combined original ATK of the monsters Tributed to Summon it. (2) Neither player can Tribute monsters
The (1) Continuous Effect applies while this card is face-up on the field.
A monster's original ATK is the printed value on the card.
If this card is flipped face-down / leaves the field, or if this effect is negated, its ATK becomes 0.
If Beast King Barbaros (with 1900 ATK) is Tributed, then ATK of Fog King is 3000.
If equipped with Megamorph, Fog King will have 0 ATK.
If Shrink targets Fog King, it will have 0 ATK, and will not change during the End Phase.
Tributed Monsters whose Original ATK is ? are treated as having 0 ATK.
The (2) Continuous Effect affects both players.
Cards / effects CANNOT be activate if a Tribute is required as cost, or part of the effect is a Tribute (ex: Share the Pain or Ritual Spell Cards).