Star Eater [MP14-EN096] Secret Rare Advent Calendar 2018 when an opponent's monster activates

when an opponent's monster activates its effect (Quick Effect): You can detach 2 materials from this card

it is changed to Defense Position at the end of the Battle Phase

negate the effect

then target 1 card in your opponent's Graveyard

except "Nekroz of Brionac"

Star Eater [MP14-EN096] Secret Rare Advent Calendar 2018 when an opponent's monster activatesSet: 2014 Mega Tins Mega Pack Card type: Synchro Effect Monster Rarity: Secret Rare Attack: 3200 Defense: 2800 1 Tuner + 1 or more non Tuner monsters Must be Synchro Summoned, and cannot be Special Summoned by other ways. This card's Synchro Summon cannot be negated. When Synchro Summoned, cards and effects cannot be activated. If this card attacks, it is unaffected by other card effects until the end of the Damage Step.