There does appear to be a small mill theme in here with Wall of Lost Thoughts and Persistent Petitioners, but I imagine that attacking with beefy creatures will be a much better avenue to pursue (though I recommend keeping this on the backburner)
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Not only is Anti-Venom immune to damage, it can also instantly resurrect something, burping up whatever strong creature is in your graveyard as soon as it comes down
Because of what youre doing, Snarling Gorehound is, by far, the best one
In our post-proliferate world, those counters can come in droves
As a result, theres no shortage of ways to turn all that Blood into wins