(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)

(I) — For each opponent, gain control of up to one target nonlegendary creature that player controls for as long as The Horus Heresy remains on the battlefield.

(II) — Draw a card for each creature you control but don't own.

(III) — Starting with you, each player chooses a creature. Destroy each creature chosen this way.