"Realization of the Goal" Shirou (APO/S53-E050 C) [Fate/Apocrypha]

[AUTO] When this card attacks, this card gets +X power until end of turn. X is equal to 500 multiplied by the number of other "Master" or "Servant" characters you have. [AUTO] [(2)] When this card is put into your waiting room from the stage, you may pay the cost. If you do, choose a "Master" or "Servant" character in your waiting room, and return it to your hand.