If your opponents are going too far wide for you to handle, Rakdos Charm can annihilate them with their own creatures provided those creatures dont have lifelink, I guess
Essence Extraction - 2.5 Mono-Black Lightning Helix for one more mana only to creatures is still Mono-Black Lightning Helix
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If they are not directly emptying their hand onto the board they will at least be developing mana and things themselves so as to be able to protect against what may come
If your strategy benefits from holding up mana and shuffling specific cards from your graveyard away, this could be your card
Whats more, the only advantage Duneblast has is that it leaves something in play, so it can be played pre-combat