Contagion Engine [The List] Friday Night Magic 2009 although it is actually a

although it is actually a compilation of small expansions and variants

it deals that much damage to each other opponent

Keranos deals 3 damage to any target

They are the masters of your mind

−4: You get an emblem with "Your opponents play with their hands revealed" and "Whenever an opponent draws a card

Contagion Engine [The List] Friday Night Magic 2009 although it is actually aSet: The List Type: Artifact Rarity: Rare Cost: {6} When Contagion Engine enters the battlefield, put a 1 1 counter on each creature target player controls. {4}, {T}: Proliferate, then proliferate again. (Choose any number of permanents and or players, then give each another counter of each kind already there. Then do it again.)