Apocalypse King of Knights, Gratos (S-BT01A-UB03/0023EN) (S-BT01A)

[Call Cost] [Put up to a total of six "Black Knight" or "Hundred Demons" from your drop zone into its soul & Pay 3 gauge]
[Counter] [Act] Choose a card on your opponent's field, and drop a soul from this card. If you do, destroy the chosen card, and if you do, deal 3 damage to your opponent! You may only use this ability once per turn.
When this card is destroyed, you gain 1 life!
[Double Attack] [Soulguard]