Contagion Engine - Scars of Mirrodin - 145

Artifact

Mana Cost: {6}

When this artifact enters, put a -1/-1 counter on each creature target player controls.
{4}, {T}: Proliferate twice. (Choose any number of permanents and/or players, then give each another counter of each kind already there. Then do it again.)

Rare · Scars of Mirrodin · #145 (SOM)

Illustrated by Daarken