If a card with dredge is in your graveyard, and you would draw a card for any reason, you may instead return the card with dredge to your hand by putting a number of cards equal to the dredge number from your library into your graveyard
For one mana, it deals with any threat, combo, hate piece, or key card at instant-speed and for a very low cost, offering answers to permanents like Deafening Silence, Pithing Needle, Rest in Peace, High Noon and others for a very low cost in addition to disrupting combos like Omniscience with ease
And if that means Nevinyrral, Urborg Tyrant and/or Piru, the Volatile, live it up
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If you arent aware, you completely exile an opponents library with Helm of Obedience and any one of those, which is certainly potent