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Typical Merfolk Mill deck with a focus on Lullmage mentor and counter spells to create more merfolk and counter more spells.
This deck has been viewed 1,127 times.
I like merfolk because they are like people except freaks and therefore not worthy of life :DDD
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http://www.mtgvault.com/ViewDeck.aspx?DeckID=38392 see if you can't find any inspiration in that.
This deck does a few things a good blue deck should, counters spells, draws like crazy, and decimates opponents decks, i think throwing in a few static orbs and oppositions will defiantly enhance your lockdown ability and make this deck pretty damn tough.