Barian's Seal

When your opponent activates a Spell/Trap Card, or monster effect, while you control a "CXyz" monster or a "Number C" monster with a number between "101" and "107" in its name: Negate the activation, then you can attach 1 monster from either field or GY to 1 Xyz Monster you control. You can banish this card from your GY; Special Summon 2 "Umbral Horror" monsters from your GY. You can only use 1 "Barian's Seal" effect per turn, and only once that turn.