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Just take into account that playing 2 Heartless Summoning will kill Stromkirk Noble , Rakish Heir or Falkenrath Marauders without some counters on them. So if you play the summonings and your opponent counters/destroys the Bloodlord of Vaasgoth , you're getting stuck with and average of 9 uselss cards until you can play another lord and get some damage in. Another way to keep it safe is to have the Bloodline Keeper Flip Flip transformed but again, summoning can kill the tokens without proper buff. Not a huge issue but something you should keep in mind.
My advice if you wanna keep summoning in, is have it x2 and one more Curse of Stalked Prey to get some counters in before they get smaller and that way you won't really play them twice often or get stuck witha summoning you don't really want to use in hand.
Lastly I'd use Volt Charge for removal and pump or card:Tezzeret's Gambit for extra draw and pump.
Other than that nice deck