Card Rulings:The Millennium Golden Elf


 * "You Can Tribute 1 monster you control" this type of tribute is a cost, and it's not a Tribute Summon, hence Sheep Token can be tributed regardless of stating otherwise.
 * Apoqliphort Towers and cards those have this effect "If this card is Normal Summoned/Set, it is unaffected by Spell/Trap effects and by activated effects from any monster whose original Level/Rank is lower than this card's current Level." can be also tributed regardless of being unaffected by card effects.
 * If Mask of Restrict is active, this card cannot activate its effect.