Nice deck but what do you do if your opponent has Laboratory Maniac and the cards to bring him back?
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If you want to splash in blue for control I'd put in Invisible Stalker as well. Hexproof and Unblockable. Plus it guarantees your Angelic Overseer is indestructible and hexproof. As for enchantments I'd put in Spirit Mantle (+1+1 and protection from creatures).