If your infect deck is doing its thing, you wont need more than two hits from this black skeleton dragon to end the game, and it gets better with power pumping effects or double strike (Fireshrieker)
These are cards such as Shelinda, Yevon AcolyteShelinda, Yevon Acolyte, Tromell, Seymour's ButlerTromell, Seymour's Butler, or Rosa, Resolute White MageRosa, Resolute White Mage
Threshold , , Sacrifice this land: Target player draws three cards, then discards three cards
Weakness: Darkness (x2) Resistance: Fighting (-30) Retreat: 1 #113 Mew V Psychic HP180 Basic Pokemon (Fusion) [P] Energy Mix: Search your deck for 1 Energy and attach it to 1 of your Fusion Pokemon
This is highly important, there are loads of decks that can only really hope to compete with green ramp if they keep the game relatively low economy