Its a strong card, but realistically, as an 8-mana creature that doesn't instantly win you the game, there are lots of equally good options out there
(To forage, exile three cards from your graveyard or sacrifice a Food.) Legendary Creature - Squirrel Warlock Chatterfang, Squirrel General Forestwalk (This creature can't be blocked as long as defending player controls a Forest.) If one or more tokens would be created under your control, those tokens plus that many 1/1 green Squirrel creature tokens are created instead
You can then tap the Crucible and remove storage counters to gain that much mana in any combination of colors - solely for casting Dragon spells or activating Dragon abilities
Card draw, ramp and a win condition presented on one card make this an incredibly powerful card
Inquisition is better general disruption than Duress, it has a wider range of targets however Duress hits a much higher % of problem cards