If a creature is about to die to something unrelated to Vampiric Dragon, then go ahead and spend two mana to put your mark on the creature, and then when it dies, you'll get a +1/+1 counter
It's one of these three: These are an awesome new bonus in every Prerelease Pack

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So far I have found them to be better than things like Reanimate and Exhume simply because you get to attack right away
It doesnt matter how strong your opponents haymakers are if they never resolve
Its easy, its simple, and its disrespectful