Knowledge Vault [Legends] Human Warrior Ally if Clockwork Beast attacked or

if Clockwork Beast attacked or blocked this combat

Demonic Type: Instant — Arcane Rarity: Uncommon Cost: {1}{W} Exile target creature

Set: Amonkhet Prerelease Promos Type: Creature — Angel Rarity: Mythic Cost: {3}{W}{W} Flying

Enchanted creature doesn't untap during its controller's untap step if it has a sleep counter on it

Knowledge Vault [Legends] Human Warrior Ally if Clockwork Beast attacked orSet: 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.