Kuon, Ogre Ascendant to Kuon's Essence: Fits in a black/green 'sacrifice creature' sacrifice shell
Since there's no color restriction you can slot Conjurer's Closet into practically any deck, though a little bit of ramp is nice since five-mana is a bit of an awkward amount when you normally will want a higher impact card going into the mid-game
It turns creatures into beefy monsters fast and gets even more scary with all The Mindskinner, Ball Lightning, and power doublers out there
Since they are such a low cost, any deck can bring them out easily
EX variants of cards were introduced in the Pokemon TCG in late 2011 and revolutionized the competitive scene
Its whole deal is that it generates more than enough Blood tokens each turn that you can use them to sneak vampires in, tapped and attacking, from your hand