It untaps all your artifacts during each other players untap step, which basically gives you a full refresh of your board every turn cycle
Sludge Titan's the latest of the group, with a trigger that fills your graveyard and essentially draws up to two cards per turn
If you kill three creatures with Cone of Flame, you might say, "I cast Cone of Flame as a three-for-one ." Imagine your opponent only has one or two creatures for you to kill, and you have to point the extra damage from Cone of Flame at your opponent instead
Yesterday, on December 18, 2016, the official Taiwanese Magic: The Gathering Facebook page posted a video giving more details on the setting for the next expansion set from Wizards of the Coast, Aether Revolt
Theres not many effects in Magic that allow you to steal your opponents best lands, but you can here