Blue-Eyes Spirit Dragon [LDS2-EN020] Ultra Rare Astral Pack 5 You can only use this

You can only use this effect of "Fossil Warrior Skull Bone" once per turn

you can remove from play 1 monster in your Graveyard with 200 DEF to inflict damage to your opponent equal to that monster's ATK

Special Summon it in face-up Defense Position during your next turn's Standby Phase

or Special Summoned (from your Extra Deck) by banishing the above cards you control (in which case you do not use "Polymerization")

Blue-Eyes Spirit Dragon [LDS2-EN020] Ultra Rare Astral Pack 5 You can only use thisSet: Legendary Duelists: Season 2 Card type: Synchro Effect Monster Rarity: Ultra Rare Attack: 2500 Defense: 3000 1 Tuner + 1 or more non Tuner "Blue Eyes" monsters Neither player can Special Summon 2 or more monsters at the same time. Once per turn, during either player's turn, when an effect of a card in the Graveyard is activated: You can negate the activation. During either player's turn: You can Tribute this Synchro Summoned card; Special Summon