A Double Tributer is a monster that can be offered as 2 monsters for a Tribute Summon, usually for a monster of a specific Attribute. This is considered an Effect and can be negated through cards such as Skill Drain.
It is possible to use them in conjunction with the Wicked Gods because they are classed as Tribute summoning, so this means you are then able to sacrifice Double Coston and one other monster to commence the tribute. The same is true when you use this method to summon Gilford the Lightning or Moisture Creature by Tributing Kaiser Sea Horse and one other monster, and you would then gain their effects as the effect states it counts as two tributes.
Types of Monster Cards
Types of Spell Cards
Types of Trap Cards
ATK • DEF • Level • Attribute • Type
Playing Field Zones
Types of Summon
Types of Monster Effects
Types of Effect Monsters
Types of Spell Speed
Aqua • Beast • Beast-Warrior • Dinosaur