Knowledge Vault [Legends] SWSH102 "Your first mistake was thinking

"Your first mistake was thinking I would let you live long enough to make a second

When Illusions of Grandeur enters the battlefield

For a Synchro Summon

Destroy this card during your opponent's next End Phase after activation

Knowledge Vault [Legends] SWSH102 "Your first mistake was thinkingSet: Legends Type: Artifact Rarity: Rare Cost: {4} {2}, {T}: Exile the top card of your library face down. {0}: Sacrifice Knowledge Vault. If you do, discard your hand, then put all cards exiled with Knowledge Vault into their owner's hand. When Knowledge Vault leaves the battlefield, put all cards exiled with Knowledge Vault into their owner's graveyard.