You can Tribute 3 monsters or 1 "Gravekeeper's" monster to Tribute Summon (but not Set) this card. When this card is Tribute Summoned: You can activate any of these effects, up to the number of "Gravekeeper's" monsters Tributed for its Summon;
?This card gains ATK equal to the combined Levels of all monsters Tributed for its Tribute Summon x 100.
?Destroy all Set monsters your opponent controls.
?All monsters your opponent currently controls lose 2000 ATK and DEF.