B.E.S. Crystal Core [CRV-EN021] Super Rare BT5-089 When any player's monster declares

When any player's monster declares an attack: You can detach 1 Xyz Material from this card

1 Lonely Sandbar

Negate the effect

Set: Sun & Moon: Forbidden Light Type: Fire Rarity: Holo Rare Retreat cost: Colorless

B.E.S. Crystal Core [CRV-EN021] Super Rare BT5-089 When any player's monster declaresSet: Cybernetic Revolution Card type: Effect Monster Rarity: Super Rare Attack: 2100 Defense: 1000 Put 3 counters on this card when you Normal Summon it. This card is not destroyed as a result of battle. If this card battles a monster, remove 1 counter from this card at the end of the Damage Step. If this card battles without a counter, destroy this card at the end of the Damage Step. Once per turn, during your Main Phase, you can change 1 face up