A single individual card from the Magic: the Gathering (MTG) trading and collectible card game (TCG/CCG).
This is of Rare rarity.
From the Scars of Mirrodin set.
Magic: the Gathering is a collectible card game created by Richard Garfield. In Magic, you play the role of a planeswalker who fights other planeswalkers for glory, knowledge, and conquest. Your deck of cards represents all the weapons in your arsenal. It contains the spells you know and the creatures you can summon to fight for you.
Card Name: Contagion Engine
Cost: 6
Color: Artifact
Card Type: Artifact
Card Text: When Contagion Engine enters the battlefield, put a -1/-1 counter on each creture target player controls. 4, T: Proliferate, then proliferate again. (You choose any number of permanents and/or players with counters on them, then give each another counter of a kind already there. Then do it again.)