Sword of Kaldra [Mirrodin Promos] Drake but I didn't expect it

but I didn't expect it from the building itself

look at the top card of your library

protection from black

exile Jace

Then if there are four or more charge counters on it

Sword of Kaldra [Mirrodin Promos] Drake but I didn't expect itSet: Mirrodin Promos Type: Legendary Artifact Equipment Rarity: Rare Cost: {4} Equipped creature gets +5 +5. Whenever equipped creature deals damage to a creature, exile that creature. (Exile it only if it's still on the battlefield.) Equip {4} ({4}: Attach to target creature you control. Equip only as a sorcery. This card enters the battlefield unattached and stays on the battlefield if the creature leaves.)