White Knight of Dogmatika

You can Ritual Summon this card with "Dogmatikalamity". You cannot Special Summon monsters from the Extra Deck. If an opponent's card or effect is activated: You can send 1 monster from your Extra Deck to the GY, and look at your opponent's Extra Deck, and if you do, send 1 monster from there to the GY. This card gains ATK equal to half the sent monsters' total ATK until the end of this turn. You can only use this effect of "Dogmatika Albaz Knight" once per turn.