Gravekeeper's Oracle [SS01-ENB10] Common Thunder You can only use each

You can only use each effect of "Infinitrack Harvester" once per turn

You can only activate 1 "Spellbook of Knowledge" per turn

Set: Hidden Summoners Card type: Equip Spell Rarity: Super Rare Activate this card by paying 800 LP

also it can be activated this turn

Set: Soul Fusion Card type: Normal Spell Rarity: Super Rare Pay 1500 LP and declare 1 Monster Type and 1 Attribute

Gravekeeper's Oracle [SS01-ENB10] Common Thunder You can only use eachSet: Speed Duel: Destiny Masters Card type: Effect Monster Rarity: Common Attack: 2000 Defense: 1500 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, and resolve in sequence, up to the number of "Gravekeeper's" monsters Tributed for its Summon; This card gains ATK equal to the combined Levels that all monsters Tributed for its