You can only control 1 face-up "Gravekeeper's Chief". Your Graveyard is unaffected by "Necrovalley". When this card is Tribute Summoned: You can target 1 "Gravekeeper's" monster in your Graveyard; Special Summon that target.
Near Mint Unlimited - $1.00
Lightly Played Unlimited - $0.90
Moderately Played Unlimited - $0.80
Played Unlimited - $0.60
Near Mint 1st Edition - $1.20
Lightly Played 1st Edition - $1.20
Moderately Played 1st Edition - $1.10
Played 1st Edition - $0.80