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Lock down and tap all their creatures and hit them hard.
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I would probably trade tumble magnet for more land like Seachrome Coast and Glacial Fortress and Island. Other than that, this has a pretty straight forward concept. How does it do in FNM?
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Now that I think about it, Dungeon Geist would be pretty good in this deck especially when you combo it with Venser and Gideon's Avenger.
It works well at FNM. The thing with the tumblr magnet is that they're in there to tap artifacts or creatures. Plus Venser is only in there to exile them so they can enter the battlefield with 3 more charge counters. And Dungeon Geist keeps them tapped but does not continuously tap them. So the Avenger wouldn't be getting any counters.
Here's my thoughts, take them as you will. :) Having played a variation of this deck for months, I can safely tell you that Venser will not help you in this deck. He's not useless and fits the color, but his abilities don't especially click with anything except for recharging the Magnets and recurring Frosty and the angel -- both of which come out AFTER him, if you can even get the mana out. You have a GREAT base for a tap-down deck. Playing with Venser will just bog things down. :) Switch him out for 3 land, straight up, because 20 is way too light in my experience. Unless you're exceedingly lucky with your land drops, chances are you'll be sitting around with bombs in your hand and nothing to play them with. Spare From Evil is not really necessary here if you're tapping all your opponents creatures anyway. Maybe switch it to the sideboard and put in Crippling Chills? Or even some other early control Like Mana Leak or Righteous Blow? Maybe Ponder? Just get something in that slot that isn't so situational. :)
http://www.mtgvault.com/ViewDeck.aspx?DeckID=332827 this is my standard Tap-deck, check it out! I'd agree with that Venser probably won't do much for you deck.