I just made a deck like this too. Except not for modern. http://www.mtgvault.com/ineedmesomescrambledeggs/decks/enduring-renewal/
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gotcha i was still stuck back in December when i was building mine i guess. jarad gets pretty big but then as you scavenge he gets weaker too..
regenerate wont work with sacrificing. if i have the two nether traitors out and the combo pieces its sac add bb use one b to bring it back and then bam! infinite black mana.
this is really similar to mine, except i havent got my hands on any varolz. You might wanna look into vampire nighthawk.