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I'm not a Commander player at all, but this makes me want to build a Commander deck around him

Its trivial to set up a winning sequence by casting this and following it up the next turn with Craterhoof Behemoth or another Overrun effect

6 Emry, Lurker of the Loch Is an Artifact-Based Combo Deck 3,061 Decks on EDHrec.com Blue mana likes artifact cards as well as instants and sorceries, as Emry, Lurker of the Loch shows

Any time you attack with any creature, you can take an attacking Vampire you control and make it a Demon as well as being a Vampire

That makes Scourge a two-mana 4/4 that gets bigger as the game goes on