I've been banging my head against my friend's BB control deck for months now. Thank you for this.
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You may want to replace contagion engine with another contagion clasp and another steady progress. The contagion engine is too high a mana cost to justify using when you have a lot of other high cost creatures. Check out my BB infect deck here and let me know what you think: http://www.mtgvault.com/ViewDeck.aspx?DeckID=148449