The Vermindoom

The Vermindoom enters tapped unless you sacrifice 3 rat permanents. When the Vermindoom enters exile one permanent an opponent controls per opponent then create X 1/1 black green Skaven Slaves, where X is half of exiled cards mana values rounded down. {t} add {c} for every uniquely named rat permanent on the battlefield. {flavor} “The Hour of Ruin is upon us... The end result was a cataclysmic event known as the Vermindoom, in which the nightmare Skaven metropolis of Blight City was partially transposed from its subrealm, with the largest chunk violently shifting into Aqshy in an apocalyptic explosion.”