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DREDGE Another common top pick for most broken mechanic is the perennial graveyard enabler

In this sense, it's hard to say what is more flexible, Flourishing Fox or Go for Blood

This can come in the form of Assault Formation effects that reverse how your combat damage is dealt, or maybe Phenax, God of Deception using toughness to mill opponents

You might cast Reforge the Soul and cascade into Whispering Madness, then cast Chain of Vapor which cascades into Wheel of Fate, all while your Waste Not bombards you with zombies / mana / card draw and your opponents watch with disgust at your amazing luck

Many of the decks that care about their graveyard are also pretty good at making you discard your hate cards before you get to use them