I could see Chandra, Pyromaster working well in this deck. If you had a Guttersnipe I believe her -7 would activate Guttersnipe 3 times. Also I think Turn/Burn could work well for killing some big creatures. You could also Turn a creature and use Chandra's +1 to kill it if she is out. Her +1 also helps you stall since the creature she pokes cannot block.
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Wow, I was actually looking for something that gave hexproof, but I completely overlooked Glaring Spotlight. Unblockable is also amazing with sacrifice. Thanks for the help!
I added Dying Wish to go along with Hellhole Flailer, once he is beefy from ethereal armor(s), sacrifice him with Dying Wish and deal two times his power to opponent. I was thinking about adding arrest, but I don't have that great early game and the earlier I can stop his creatures the better. I might switch two Pacifism for two Arrest. Will definitely side board them though.