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

You can only use this effect of "Booster Dragon" once per turn

except “Thunder Dragondark”

Negate the activated effects of your opponent's monster that have Predator Counters

when another monster's effect is activated (Quick Effect): You can negate the activation

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

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