If you want to see the card in action make sure to check out this week's Against the Odds , but the short version is that Soul Spike works incredibly well with Necrodominance
You also have a good chunk of your deck that is available for hand trap space, due to the amount of starters and searchers you run, but I personally have opted to run a version that is heavy on the gas
Narset, Jeskai Waymaster Narset, Jeskai Waymaster gives you an explosive draw option at the end of your turnif you're willing to let go of your hand
Creature Eldrazi Annihilator 2 (Whenever this creature attacks, defending player sacrifices two permanents.) Whenever an opponent sacrifices a nontoken permanent, put that card onto the battlefield under your control
Aclazotz, Deepest Betrayal Aclazotz, Deepest Betrayal does what black can do better than any other color: Force opponents to discard cards
And when used in a dragon deck, this card can be a huge part of an incredibly devastating dragon attack