"Final Flash" Saber of Red (APO/S53-E028SP SP) [Fate/Apocrypha]

[AUTO] When this card is placed on the stage from your hand, you may put the top card of your clock into your waiting room. [AUTO] [CXCOMBO] [(2) Put a face up card in your level face down] When this card attacks, if a card named"Clarent" is in your climax area, you may pay the cost. If you do, deal X damage to your opponent, and this card gets +3500 power until the end of your opponent's next turn. X is equal to the number of face down cards in your level. (This damage may be canceled)