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First it was the "accidental" leak of a mechanic many have labeled "Megamorph." And, on the eve of Dragons of Tarkir spoilers (that came along fast, didn't it?), we'll take whatever spoilers we can get.
So here's another.
Not so helpful? Here you go.
Deathbringer Dragonlord (or Reaper Dragonlord ? I don't know its official Eng name)
5BB
Rare
Creature - Dragon
5/6
Flying
When ~ enters the battlefield, if you cast it from your hand, and there are five or more other creatures on the battlefield, then destroy all other creatures.
This is just the start of things to come, so keep your eyes peeled here for more spoiler coverage as it comes in.