I actually did it! I beat a kozmo player with god damn gravekeepers. the dingus didn't play around the secret tombs of necrovalley and lost a lot of cards and life points because of it. He could've outed it with good which but he didn't. Instead I stalled out and the fool attacked into gravekeeper's shaman who i tributed for a spy or something. 3800 def to dark destroyer's 3000 left him -400 over his limit. 

I also beat a inferno tempest player by out decking him and stalling. I had one gravekeeper or two left in my deck after inferno tempest went off so I was able to Imperial tomb of necrovalley his D.D Dynamite. 

Also I rekt a speed roid player with Royal Tribute and necrovalley. 99% of his hand was speedroids and monsters and his only trap was negated by necrovalley. This was first turn.