Castle of Dragon Souls

Once per turn: You can banish 1 Dragon monster from your GY, then target 1 monster you control; it gains 700 ATK until the end of this turn (even if this card leaves the field). When this face-up card on the field is sent to the GY: You can target 1 of your banished Dragon monsters; Special Summon that target. You can only control 1 "Castle of Dragon Souls".