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Worldspine Wurm on turn 4? Okay. Here's how the deck works. Get Boneyard Wurm out (if you don't have a creature card in your graveyard then play wildguess or faithless lootings). Play Descendant's Path. Get Beast Tracker to put the Wurm on top of your deck. Play it without paying mana cost.
Your opponent wants to play removal on your wurm? Thanks man, get 3 tokens and goes back into deck. Get wurm in your opening hand? Play Faithless lootings or Wild Guess to discard him (thus putting him back into your library)
I like the construction of the deck, but it's impossible to get the wurm on turn 4. You'd get it on turn 5 during your upkeep, because turn 2 is spent on getting Boneyard Wurm out, and 3 and 4 are spent on getting Descendants' Path and Mwonvuli Beast Tracker . You need Descendants' Path before you get the beast tracker out, and you can't get both it and Boneyard Wurm out by turn 2.
It's good to have spells preventing combat damage, but you leave yourself open to counterspells and direct damage. I recommend 4x Revive , along with Predator's Rapport . This ensures your Boneyard Wurm isn't wasted too quickly, and will boost your life if you're already running low by turn 5.
Let me know what you think.
Also, regarding Boneyard Wurm being a blank:
704.5f If a creature has toughness 0 or less, it's put into its owner's graveyard. Regeneration can't replace this event.
You must have a creature card in your graveyard in order to play it, unless you plan to let it end up in your graveyard immediately.